I've never heard the other but did own the Studio II. It's an interesting speaker that I ran with a Coda Csib 150 wpc. The speaker is very power hungry because it uses, I believe, a subwoofer for the bass and mids. I've never seen someone run a sub for mids but the result is a very tame speaker, little fatigue, full body sound.
I did eventually want more fleshed out mids than this speaker could deliver. Now in the defense of the speaker, I had come off a fatigue, bright ear speaker, so the laid back nature was welcome, it just became too relaxed and I stopped listening as much.
Good luck with your search.