Switch is kind of different to past Nintendo systems in this regard-- where in the past if you buy a Nintendo system as your secondary you obviously just want the first party titles, so it wouldn't be strange if you only own ~12 whole games. With the Switch, even if it's your second system, lots of people will want to pick up Doom, Skyrim, Borderlands, Bioshock, Witcher 3 etc. just to have them on the go.
To answer the question, Third Party. But I obviously bought the Switch mostly for First Party titles.