Well,
going on what we saw with PS3 and Xbox 360, if I was a developer I would much rather work on whatever platform was the least hassle to work with. And PS3 was very hard to work with despite being more powerful. I would not write it off as being an indicator of anything.
I'm much more interested in seeing if the online portions of these machines will be better. Many online enabled games have short lifespans, with low player counts, player host advantages, communities full of kids, little in terms of value for what you are paying in their subscription, slobby UIs, ads and so on.
That's were I think the battle is won. And I think these things will matter in other, now very-relevant Asian territories like Korea and China.