Sony - PS2.
The best console of all time. The library is just insane, so many great games from all genres. Plus backwards compatibility and dvd player as a bonus. It sortadestroys every other Playstation console, even the PS1.
Microsoft - Xbox 360
Great library of games. Xbox Live really was a significant push for online gaming. XBLA did a lot for the indie scene.
Nintendo - The Switch
It's hybrid nature makes it really versatile,taking it on the go is a huge plus. Great library of games, especially from the first party.
Bet with Intrinsic:
The Switch will outsell 3DS (based on VGchartz numbers), according to me, while Intrinsic thinks the opposite will hold true. One month avatar control for the loser's avatar.