What class is the best easy pve solo?
It all depend what you like to be honest Gabe , But don’t pick a mage since they burn to MP fast . go with Melee class or arching or healing
Barbarian. 
Sadhu or Corsair good too?
Easy, highlander to barb, cater stroke will make it so simple
until you out of mana…
Swordman > Everything actually.
Archer is pretty nice once you hit a high level
Monk late game is just ridiculous too tbh
Barbarian, you get basically 3x amount of exp , than other classes as good barbarians can overkill for days.
You sure you don’t have them swapped around? I have a Wiz>Pyro at 70 as a secondary character. I’ve never had to sit at a bonfire and I still have most of the mana pots I bought at the start of the game… My Archer on the other hand… I had to sit at a bonfire or pop mana pots every room I cleared.
As for OP. Barb is probably the go-to atm, with Pyro being a close second if you ask me. Pretty much everything else falls behind, but third place would most likely be some other Swordsman build.
About mana problems, just chug those mana pots. Not need to gimp yourself wasting points on SPR nor waste leveling time sitting beside a bonfire.
i actually NEVER run out of mp, just buy enough mp pots, lol, they cost like nothing.
without spr you don’t have the sp pool to support skill use on cd without running dry on the potion cooldown
Monk lategame is OP (with priest 3x)
Every class has some easy to level with Archtypes.
Mages have Pyromancer, breeze PVE with it.
Clerics have Krivis and Bokor for easy PvE.
Swordman, idk since i haven’t played them but overall i hear swordmen are pretty cookie cuttuer at the moment, slashing right and left.
And Archers idk either.
Highlander-Barbarian
Ranger.
Archers get better AoE at laters ranks, so they feel weak until Rank 4.
yeah you either get Ranger to be able to grind some aoe mobs ( with a very annoying cooldown since it takes both charges to kill 1 mob every 18 seconds) but then you have to rely on barrage for single target, which makes you into a melee class ( barrage doesn’'t scale as well as multishot either, so it falls off quick, even with ranger rank 3)
or you go with archer 3 for superior single target but no aoe besides oblique ( not aoe…)
Barbarian - You are level 200 while your Mage friend is level 120-130
Belive me they are saying the truth Barbarians use to level so fast compare to mage.The gap is just ridiculous.
its not the barb…
its the highlander!!
passive crit damage from highlander+cartar stroke needs nerf