[Scotracer]

General processing power (mathematics): PS3 significantly more powerful
AI integration (branch prediction): 360 more suited
Graphics processing: without the Cell's help, the PS3 is less powerful than 360 but with it, it is more powerful
Memory: Both 512Mb but PS3 has 256Mb of XDR (@ 3.2Ghz) which is significantly faster than the GDDR3 in the 360

Overall: PS3 is potentially more powerful.