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No, lets really be fair here - nVidia (employees) are almost on record saying that they will NOT support even major releases of X unless a (major?) distribution supports it first.
Since those proprietary drivers are now out, whether or not Fedora has a prerelease X or not is a moot point.
Hardware support in this case is equal. Not in the case of ati though - the fglrx still does not support Fedora 9. But then again, Fedora currently has in testing free 3d drivers for R5xx based cards. Swings and roundabouts.
Except for "Restricted Driver Manager", i would say hardware support is similar. With one you have newer kernels supporting more hardware. With the other, you have out of-the-box GUI to get proprietary driver support.