Not a raw comparison. But.
I tried Pete's first, ran it for a day or so. Basically Pete's is a stock barebones Gingerbread ROM. No tweaks or scripts. I'm sure GPA10 will get some themes shortly. And Pete will be releasing a fully tweaked Bugless Beast when he gets it done.
Chevy's SS GB has tweaks built-in, and ChevyNo1 Tools lets you tweak and customize quite a bit of look and feel of your phone.
So right now Chevy's has what I want in a GB ROM. Oops, I just saw that UD 3.0.0 was just released, gonna have to check it out as well.
Happy flashing.