All the various move orders are used to avoid one or another strong replies from white. The choice should be based on what you like to play as black
Classical 1.e4 c5 2.Nf3 d6 3.d4 cd4 4.Nxd4 Nf6 5.Sc3 e6 can be met with Keres attack 6.g4 - not everyone is happy with that
In another classical line 1.e4 c5 2.Nf3 Nc6 3.d4 cd4 4.Nxd4 Nf6 5.Nc3 d6 white has Richter-Rauzer attack in his disposal (6.Bg5)
Same move is possible in Najdorf move order 1.e4 c5 2.Nf3 d6 3.d4 cd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 - the line is very complex, dangerous and is backed by tons of theory
Paulsen might be the most flexible move order to reach Scheveningen structures 1.e4 c5 2.Nf3 e6 3.d4 cd4 4.Nxd4 a6 holds development of Ng8 making Bg5 or g4 infeasible. Here however, white may utilise the fact that Nb1 was also not developed and switch to Maroczy bind with c4
Look at all those options and choose whichever you feel the most comfortable on black side (I used Paulsen at some time, I like playing hedgehog structures against Maroczy bind)
So I am going to start playing the Scheveningen Sicilian, but I was wondering what difference move order makes when getting into a Scheveningen? I know there are lots of ways to get in a Scheveningen structure, (Paulsen, Classical, Najdorf move orders) and I was wondering what differences these move orders make?
Also are there any new books on the Scheveningen?
I also need a book that cover (hopefully) all the anti-sicilians, so a recommendation there would be good :)
Thanks in advance.