I believe the Studios are slightly better. IMHO.
(Since I own them, they must be the best, right?!)
However, the Theils are also quality speakers.
I doubt you would go wrong with either one.
I don't think it takes hundreds of hours to break in the Revels though. Maybe a hundred hours or so. They sound pretty good straight out of the box, but I will agree that they do sound better the more they break in.
The Revels should sound good with your Krell amp. I use a Mark Levinson myself.
Good Luck in your search.