Because I do use and benchmark both radeon (both R300g and R600g) and Intel (GM45 and Sandy Bridge)? I opened something like 30 bugs for GM45, when I tell it does suck it's because of problems, lots of problems. I still have to apply patches to vanilla kernels to be able to use the G45 shit. I never felt the need of S3TC with Intel cards and so I never tested it and never cared.
Did you test Sandy Bridge? Can you tell me why don't you like it?
## VGA ##
AMD: X1950XTX, HD3870, HD5870
Intel: GMA45, HD3000 (Core i5 2500K)