The extra stages are nice and all, but still don't make it a "better" port for me - in the same way the extra dungeons in the GBA port of FFVI don't make that version of the game superior.
That said, every console version of Lost Vikings is good. The only ports I would advise people to avoid are PC and Amiga (mainly due to awkward control schemes - though I suppose you could use Joy2Key) - a bit of a moot point, as I doubt anyone here would be inclined to play those versions anyway.

