If I am not mistaken, Studio Eight is the... Mai-Series Team.
The ones responsible for Mai-Hime/Otome/Xenoglossia/Kakeru Shoujo.
Studio One seems to be the A-Team of Sunrise teams for it seems to be the one in charge of most of the big titles ( Gundams, etc ), but that doesn't necessarily indicate it being definitively the best team because they were also responsible for Tales of the Abyss.
If I'm not mistaken.
Kakeru Shoujo (2009) is so bad in my opinion. Because the story really makes NO sense whatsover. The thing was: Why the evil turns good? Why is good turns evil? WHY?! Just WHY?!