Warrior is easiest to PLAY, but their items cost the most. HOWEVER, you dont need great items to hit hard / ks and roll in pk. Atleast not until 70-83.
In ardream and rlb, everyone always runs past warrior no matter how even if rapter +6 no glow, half chitin, half shell, no helm and go for gangbang priest. I would know.
I have a 20gb battle priest right now and I get raped without iron set.
If I trasfer to warrior, with 10gb (shell set, rapter 8) I would do okay I think.
As for archer, you can shoot far of course and not always heat of battle. Run and shoot, and if you have nice gear maybe face to face vs.
Priest is hard
Mage can be hard if you are not cordinated with AOE, cannot TP fast enough, or not good items for damge /stun.