Who cares which one is more powerful? The majority of games will be released for all consoles and be tuned for the least powerful console of each generation. Every generation has the same ridiculous argument about which is more powerful, and every generation sees the same results. The developers like to deliver a consistent product when its available on multiple systems. Hell, most of em even deliver the same crap textures for the PC version, and you are lucky to see an optional patch that includes higher resolution ones.
An exclusive title's graphics can be impressive as far as consoles go, but then there's nothing to compare it to. Games like the Halo series, or a title like "The Last of Us" still use crappy, muddy textures for the majority of things but then use really detailed character models that you spend most of the time looking at, thinking wow the whole game has amazing graphics. No it doesn't. Most of the screen looks like crap and its only what has your focus actually looks half decent.