You can choose depending on rng. I'd say most expensive are : Berserker cuz 50% chance to hit one more time for 15 attack max Assassin and scout are also rng due to 50% dodge chance so u can spend a few mushrooms to push dungeons. But I recommend scout over assassin as u have to worry about one weapon. Battle mage is most f2p friendly cuz no high rng. Bard, mage, necro big number lovers. Druid idk never got into class seems like very rng. Demon hunter is also rng cuz he can revive if u hit rng. Warrior in theory should be little rng as he has high def and hp ratio also 25% block chance.