Allods Online Forum

Do as many of us did.
Choose a class which you think is the best and you wold like to play.
Get to endgame and make a reincarnation of your choosing.
Then eventually stay on your reincarnation as your main.

every class can be good at pvp with correct spec, but i think from the ones you mentioned warriors pvp spec is closest to the "Normal" pve spec
engineer and mages pvp spec are a bitdifferent from usual dps spec

but as said, choost what is joyful for you, nothing else matters, you can make a reinc later if you really do not like the class