I'm not sure of the differences (sorry I'm still new to the osx86 scene) but I think Kalyway has a 10.5.2 release for AMD as well. I'm using Zephyroth updated to the 9.2.2 kernel and System kext, and so far I haven't had any problems. I guess the only way to really make a decision would be to try all 3 and see which one you personally like the best.