what is the best anti Sicilian for white?


Not the only one. There is also the good old Wing gambit 2. b4 played already by Greco!

It should be 1.d4 as this is the only move that counters 1...c5

I like the potential of the Closed Sicilian for White because you get an early pawn to f4 and grab a lot of space, but I haven't been able to make in work in unrated or vs engine games.
I've had decent success with the c3 (Alapin) Sicilian which can sometimes be transposed into a French Defense, which usually isn't the style of the Black player.

On 1.d4 c5 is also possible. After 2.d5 e5 3.e4 d6 we have the good old Benoni wall.

A great way to avoid any possible transposition to the Sicilian is to play 1. b4! so he cant play c5.

Out of all anti-sicilians, I also think Bb5+ is the best. A sicilian player myself, it is always annoying to play against. It's actually one of the reasons why I switched from the Najdorf to the Kan variation. The other reasons being mostly that I don't consistently get decent positions with the Najdorf and the Kan basically plays itself.

Out of all anti-sicilians, I also think Bb5+ is the best. A sicilian player myself, it is always annoying to play against. It's actually one of the reasons why I switched from the Najdorf to the Kan variation. The other reasons being mostly that I don't consistently get decent positions with the Najdorf, but the Kan basically plays itself.
If black knows what to do, he can easily equalize after 3.Bb5+.
For example:
A number of possibilities are discussed in:
Starting Out: The Sicilian by GM John Emms (2009)
https://web.archive.org/web/20140627122350/http://www.chesscafe.com/text/hansen123.pdf
Suggestions can be found in:
A Simple Chess Opening Repertoire for White by Sam Collins
http://www.gambitbooks.com/pdfs/A_Simple_Chess_Opening_Repertoire_for_White.pdf
My First Chess Opening Repertoire for White by Vincent Moret
https://www.newinchess.com/Shop/Images/Pdfs/9033.pdf
Chris Baker's A Startling Chess Opening Repertoire
http://www.theweekinchess.com/john-watson-reviews/more-nco-gambits-and-repertoires
John Emms's Attacking with 1.e4
https://web.archive.org/web/20140627003909/http://www.chesscafe.com/text/hansen29.pdf
http://www.theweekinchess.com/john-watson-reviews/one-book-repertoires-online-bargain
Kaufman's original repertoire book, The Chess Advantage in Black and White
https://web.archive.org/web/20140626223458/http://www.chesscafe.com/text/hansen62.pdf
http://www.theweekinchess.com/john-watson-reviews/in-the-beginning-there-was-theory
Sam Collins's An Attacking Repertoire for White
https://web.archive.org/web/20140627122005/http://www.chesscafe.com/text/hansen66.pdf
Chess Openings for White, Explained by Alburt, Dzindzichashvili & Perelshteyn (2006)
https://web.archive.org/web/20140627032909/http://www.chesscafe.com/text/hansen89.pdf
https://web.archive.org/web/20140626210017/http://www.chesscafe.com/text/hansen132.pdf
http://www.theweekinchess.com/john-watson-reviews/good...good...good...disastrous
The King's Indian attack - Move by Move by GM Neil McDonald (2014)
Starting Out: King's Indian Attack by John Emms (2005)
https://web.archive.org/web/20140627034051/http://www.chesscafe.com/text/hansen81.pdf
The Complete c3 Sicilian by Evgeny Sveshnikov (2010)
https://web.archive.org/web/20140626234618/http://www.chesscafe.com/text/hansen141.pdf
https://www.newinchess.com/Shop/Images/Pdfs/944.pdf
How to Beat the Sicilian Defence by Gawain Jones (2011)
https://web.archive.org/web/20140626195254/http://www.chesscafe.com/text/hansen147.pdf
https://www.newinchess.com/Shop/Images/Pdfs/6085.pdf
Starting Out: Closed Sicilian by Richard Palliser (2006)
https://web.archive.org/web/20140626175558/http://www.chesscafe.com/text/hansen87.pdf
The Grand Prix Attack by Evgeny Sveshnikov (2013)
https://web.archive.org/web/20140626232217/http://www.chesscafe.com/text/hansen171.pdf
https://www.newinchess.com/Shop/Images/Pdfs/979.pdf
Mayhem in the Morra by Marc Esserman (2012) https://web.archive.org/web/20140627043409/http://www.chesscafe.com/text/hansen160.pdf
The Rossolimo Sicilian by Victor Bologan
https://web.archive.org/web/20140626195254/http://www.chesscafe.com/text/hansen147.pdf
https://www.newinchess.com/Shop/Images/Pdfs/952.pdf
Rossolimo and Friends by Alexei Kornev (2015)
http://gainesvillechesstraining.com/?page_id=393
https://www.newinchess.com/Shop/Images/Pdfs/7501.pdf
The Modern Anti-Sicilian: 1.e4 c5 2.a3 by Sergei Soloviov (2014)
https://www.newinchess.com/Shop/Images/Pdfs/7393.pdf
A Chess Opening Repertoire for Blitz and Rapid by Evgeny and Vladimir Sveshnikov
https://www.newinchess.com/Shop/Images/Pdfs/9020.pdf
Coming soon:
Playing 1.e4 - Sicilian & French by John Shaw
If you decide to go for the open Sicilian, you could look in:
Taming the Sicilian by Nigel Davies (2002)
https://web.archive.org/web/20140627033203/http://www.chesscafe.com/text/hansen46.pdf
Experts vs. the Sicilian edited by Jacob Aagaard & John Shaw (2006)
https://web.archive.org/web/20140626225408/http://www.chesscafe.com/text/hansen71.pdf
http://www.qualitychess.co.uk/ebooks/Expertsvsthesicilian-excerpt.pdf
Seven Ways to Smash the Sicilian by Yuri Lapshun & Nick Conticello (2009)
https://web.archive.org/web/20140627015506/http://www.chesscafe.com/text/hansen126.pdf
Dismantling the Sicilian by Jesus de la Villa (2009)
https://web.archive.org/web/20140627002658/http://www.chesscafe.com/text/hansen129.pdf
Sicilian Attacks by Yuri Yakovich (2010)
https://web.archive.org/web/20140627063241/http://www.chesscafe.com/text/hansen145.pdf
https://www.newinchess.com/Shop/Images/Pdfs/946.pdf
Slay the Sicilian by Timothy Taylor (2012)
https://web.archive.org/web/20140627043409/http://www.chesscafe.com/text/hansen160.pdf
https://www.newinchess.com/Shop/Images/Pdfs/7080.pdf
Steamrolling the Sicilian by Sergey Kasparov (2013)
https://web.archive.org/web/20140627101148/http://www.chesscafe.com/text/hansen174.pdf
https://www.newinchess.com/Shop/Images/Pdfs/987.pdf
MODERNIZED: The Open Sicilian written by IM Zhanibek Amanov and FM Kostya Kavutskiy (2015)
http://claudiamunoz.com/index.php/en/chess-book-reviews/5430-my-book-review-modernized-the-open-sicilian
https://www.newinchess.com/Shop/Images/Pdfs/7500.pdf
Grandmaster Repertoire - 1.e4 vs The Sicilian I by Parimarjan Negi
http://www.qualitychess.co.uk/ebooks/Negi_1e4_vs_the_Sicilian_One-excerpt.pdf
Grandmaster Repertoire - 1.e4 vs The Sicilian II by Parimarjan Negi
http://www.qualitychess.co.uk/ebooks/GrandmasterRepertoire1e4vsSicilianII-excerpt.pdf
Grandmaster Repertoire - 1.e4 vs The Sicilian III by Parimarjan Negi
http://www.qualitychess.co.uk/ebooks/1e4vsSicilianIII-excerpt.pdf
Neil McDonald's Starting Out 1.e4
https://web.archive.org/web/20140627032909/http://www.chesscafe.com/text/hansen89.pdf
http://www.theweekinchess.com/john-watson-reviews/opening-books-en-masse-part-3

Out of all anti-sicilians, I also think Bb5+ is the best. A sicilian player myself, it is always annoying to play against. It's actually one of the reasons why I switched from the Najdorf to the Kan variation. The other reasons being mostly that I don't consistently get decent positions with the Najdorf, but the Kan basically plays itself.
If black knows what to do, he can easily equalize after 3.Bb5+.
For example:
I have a few minor disagreements with your post.
1) The position after 5. c4 where you have black playing e5!? I would not call equal. White has some symbolic advantage of better bishop, which can be very serious if the position opens somehow. Not saying it's much, but I'd take white.
2) There are other, better tries for an advantage for white after 5. 0-0 than what you gave. Not sure if there's anything concrete, but there's a lot of room for white to find something. White can play with Qe2+b3, or Qe2+Rd1, or 5...Nf6 6. e5!?, which may be equality, but maybe not as easy as you say.
Talking again about 5. c4, another site has a lengthy series of videos by Robin Van Kampen about how to play with white and he claims some advantage. I may try to find it and see what he says. Until then, white has another setup you don't mention, which involves an early b3. See the game Étienne Bacrot vs Anish Giri (I think from 2013?) and you'll see how white can play.