Well bigger is certainly better for OB. No doubt.

I like OB because it's fun and easy. But you do need to trade box for cone surface area. And power.

I don't know if you can see photos on Audio Circle without joining, but you may want to look at my thread there. Sure wish you could come to Dallas to hear the rigs. WOuls love to meet you and know what you think.
Big OB rig in Dallas LSAF (mid May)