from what i saw till now
Pally->Mage/psi/Summy-> rest
so if you want to do high singletarget and aoe dmg go pally its rrly strong atm and can also tank if you need it also cuz its a plate class you have more life by default but pally is pretty much a melee so if you want to play ranged go summy,psi or mage they are pretty equal in terms of singletarget dps
but generally you can say there is not soooo much of a diffrence beetween classes dps anymore all classes do a good amount of damage in singletarget (aoe still big diffrences like dont try to out dps a scout as a warden for example its not gonna work

)
but if you consider pvp too dont go psi mage and summy are waaay stronger atm especially in grp fights