For leveling, I feel a caster/pet build is easily nicest because it lets you kill things from distance with good DPS while your pet tanks. You can also practice your basic knockdown -> Maul -> Vortex -> Shred combo on tougher enemies (this combo will be your bread and butter at high level in all likelyhood). Also caster/pet is good for low level PvP -- you can keep your distance while dealing maximum damage, and have access to heals and stuff.
The build I've used for leveling on the p2p server has been something like this:
lv27 ->
http://eu.allodswiki.ru/calc/#!5!132.1.3…/O!emzsb/KINHKB
lv40(ish) ->
http://eu.allodswiki.ru/calc/#!5!133.3.3…OD!gpzsb/KINHKB
you can replace Morte with Storm or something if you want more AoE, and the Renew rubies can be switched out for more DPS if you like I suppose... and I have no idea how viable this is for endgame before I have done zero endgaming whatsoever since the last big warden change ;p But for leveling, in my experience, something along these lines is totally solid!