Which is better?

[The Jackal]

Some N64 roms are named "V1.1" or "V1.2" etc. These roms are modified in some way, right?

But which is better, a rom named, for example:

Castlevania (U) (V1.2) [!]

or

Castlevania (U) [!]

Now which is better? The modified version, or the non-modded one? And what's the difference between them? Since as far as I know, both of them works.

[Doomulation]

The 1.2 or newer version just has some bug fixes and released in a new version. So there's no point in getting newer or older, get whatever you can get your hands on.