Franzea. Some characters kills such as straight foward ones (Kratos, Sly, Ratchet's, Fat Princess lvl 1 and Good Cole, Dante, Spike's lvl 2.) can be interrupted when the stage shifts around and have you hitting a hump of the stage and shortens your distance of having a chance of kills or falling into the water.
If I'm Nariko and I want her level 3, I know that stages like Time Station, Invasion, Alden's Tower, Sandover Village, and Black Rock Stadium aren't good for that. So I'll have to use lower supers and avoid supers more.
But there really is no stage I'd call the worst. I love 'em all.