1-20 is a weird range, because for a significant chunk of that time classes are pretty similar. Around 10 spells and skills start to differentiate classes more, but a lot of classes don't really come into their own until the 20s.
Solo, I'd probably say rogue. All the caster classes get some sort of help from their spells, be it buffs, heals between fights, pulling with a nuke/dot, etc. Monks get dual wield at 1 and warriors get zerker. Rogues on the other hand are pretty gimp until they get backstab and dual wield, which is 12 iirc, so over half the level range you're talking about.
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