The NV vs FO3 will never end. but even if NV is better, obsidian don't deserve full credit for basically remaking and improving a existing game. its not that hard to take a good game and improve it. fo3 was a new engine, new gameplay etc.
its like people saying pokemon silver is better than pokemon blue. Yes I suppose it is improved, but its basically the exact same formula, I always feel that a game should be appreciated for its originality at the time of release. ocarina of time is still a 10/10 because it was released in 1998, if it was released today I would give it a lower score.
NV came out 2 years after FO3, by then it wasn't that original or interesting.