Might depend on the type of games. For FPS and racing games, you might enjoy the extra width of widescreen for more peripheral vision. For strategy, you might enjoy the more square shape, so you don't have a narrower height.
Also, some older games may require more effort (editing text files) to make work with widescreen, and there could be cases where some old games won't support widescreen though I don't really know for sure. Even if you don't know a lot about computers, you can probably ask other gamers about how to do it for each game though.