Hardly anyone has PES3 as it isn't finished and only a few reviewers have seen advanced version which are incomplete.
Both games seem to be the same apart from the languages.
WE7 is on CD and is easily patchable.
PES3 is on DVD and will be more difficult to patch if at all possible.
To consider which is a better game, which set of kits would you prefer to use? The default crappy PES3 ones, the edited but still not right PES3 ones or the patched WE7 ones which will look better than:
I think most people would turn off the commentary and play with a patched version of WE7 rather than PES3.
But this isn't the only way it could happen.
There is a chance there PES3 could be patched too - it may be a bit more of a hassle to sort it out though. Or there may be the possibility of putting English commentary into WE7. We'll just have to wait and see.