When will PS3 version of multiplat games be better than Xbox360 version?

[XxXProphecyXxX]

WOW....is the difference really that big? almost all MP games look identical on both sometime a bit better on ps3 sum times on 360 and besides even if they can do better with the ps3 devs wont make the ps3 version look tad better than 360 cause they want to make it fair for both console.