Recently I have gotten my hands on Ultimate Marvel vs.Capcom 3, and I have never played or own Marvel vs. Capcom 3: Fate of Two Worlds. Plus I have a few other games that have received updates or remakes. The games are: Final Fantasy IV Advance, Legend of Zelda: Ocarina of Time, Megaman Zero 1-3, Metroid Prime 1-3, Megaman Battle Network 5, and Pokémon Silver (Yes I played that).

That being said, I know these games have received an update or a remake or been collected into to some kind of collection like Metroid Prime Trilogy, Megaman Zero Collection, Metal Gear Solid HD Collection, Ninja Gaiden (The Second trilogy), Devil May Cry, Splinter Cell and some of the games above got a remake/update.

So my question is: Is it a good idea to buy a remake of a game or games that have been collected into one game, even though you have some of the other games? & Is it a good idea to buy the original after getting the updated version, like UMvC? Plus is it a good idea to buy the updated version of a game?