Imho, Najdorf is better while Sveshnikov is trickier.
Nadjorf or Sveshinikov
Sveshnikov dumps the whole conceplt of 1.. c5, in my opinon if you play the sicillian go for the sharpest and most complicated lines there are or there is no real reason to play it at all, so Naidorf it is, chess for us amateurs is about having fun playing and going to the limits of our ability, let the pros do the computer draws.

Don't play Sicilian switch to e5. Who on earth would spend time on those Anti-Sicilians.
I don't mind playing against Anti=Sicillians I have a good book for that and also have done research
The Sharpest Sicilian by Kiril Georgiev & Atanas Kolev (2007)
https://web.archive.org/web/20140627101750/http://www.chesscafe.com/text/hansen96.pdf
The Easiest Sicilian by Atanas Kolev & Trajko Nedev (2008)
https://web.archive.org/web/20140627012235/http://www.chesscafe.com/text/hansen111.pdf
Hi guys I like both the Nadjorf Sicillian and the Sveshnikov but am not sure which one to focus mostly on and include in my OTB repitiore. I like sharp games and dont mind lots of theory, other openings I play are the Grunfeld and occasionally French Winawer, and the Scotch Game. But either the Sveshnikov or Nadjorf will be my main reply to 1.e4. In my games I prefer aggressive play and active pieces although can play positionally too. which opening would you recommend and why, What are your experiences with each opening playing them.