I usually make Lae'zel a Battlemaster at lvl 3 and as she has the Great Weapon Fighting feature I give her the Great Weapon Master feat at lvl 4, and she gets a greatsword, which with 2d6 has most damage of the twohanders. At lvl 4 she can deal 98 damage (in theory, before hit chances, no crits, no potions or items) in the first three turns, my Berserker Barbarian achieves only 100 in comparison (with better hit chances of course).
