"First-party" and "spinoff" are not opposites; the first is only related to who owns the platform the game appears on. I believe that every Mario game but Super Mario Run is first-party, though there might be some obscure game I'm missing.

A spinoff is a game not in the main series, which is every fucking game that either of the two have appeared in except maybe Super Mario Land, with that being a very big "maybe"; I don't quite understand how it counts. Also, the Super Mario Wiki seems to count Super Mario Run as not being a spinoff…

Anyway, Daisy appearing in that one Gameboy game 30 years ago and her being in the mobile game is not a good argument for putting her above Waluigi, though "who is better" doesn't matter at all.

And the disturbing thing, is that it's more in character with the Wah.