Why not 2-3? I still don't get going M2M when they have no outside threat. I think 2-3 is probably the best.
Because it's hard for your nimble point guard to steal the ball from an out of position center if he's off playing in a zone somewhere. And you don't want to make the passing lanes too open, to the point that even three skilled donkeys can hee and haw and get the ball down low.
I'd actually give more consideration to the 3-2 than a 2-3 unless you've got some really specific skills on your big men. All the inside scoring in the world isn't a threat if every possession is a bunch of Gigantors trying to figure out how to get the ball near the bucket and either turning it over or having to take long, contested jump shots.