I only own five, of which, as appears to be a popular opinion, Splatoon is undoubtedly my favourite and Super Mario Maker is a confident second. They're totally different games, of course, the latter being very laid-back when making levels; the styles of game complement each other neatly and I'd go as far as to say that they're the two definitive games to own for the console, particularly due to the unlimited replay value of each (unlike a game that plays mainly or exclusively through an offline story).