>But you could have the least worst of the three worst evils.

Well...you have murder, rape, and armed robbery as the three worst on a listing of crimes. Say murder is the worst (though some may put rape as the worst), but armed robbery would definitely be the least worst of the three. It's definitely not the best, there is no best crime.

who would you pick for the play?

Well, dxb, from my experience there's some excellent actors who have trouble memorizing their lines, but who always seem to pull through in the end (and you can always cover for a dropped line or two along the way). OTOH, an inability to speak clearly or understand character makes for a weak or disastrous performance and is destructive to the entire production and unfair to the other cast members...so I'd have to opt for the one who has trouble getting their lines down. So that would be the least worst of the three for me.
But you could say it's the best option or the best bet.