MH3U seems to offer the most content. Game & Wario would seem to offer the least. Sonic and W101 are about equal, I'd think.
Then again, it depends on what type of game you prefer. I tried the MH3U demo, but didn't enjoy it at all. Not my type of game.
Nintendo Network ID: Cheebee 3DS Code: 2320 - 6113 - 9046