The first remix was alright, considering you took it in the direction of a hard rock sequence, which I kinda dislike. It actually sounded a lot better than the original ending, which took a small, lighter tone.
The second remix sounded good, though it sounded a bit off, and I think I still like the original better.
I never played the first Megaman X, so I can't say whether it was better or worse than the original, but from what I can tell it was pretty nice.