It really does not matter as you hit exp cap soon enough (4,6 levels roughly) and there are much more enemies than exp needed.
Solo kill list: One stupid evil (displayed alignment) Githyanki warrior, a dark grove, a Zhentarim hideout full of "experienced" rogues, half a Goblin camp including two hobgoblins, two minotaurs, a bunch of underworld monsters and their wannabe sorcerous overlord
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