I voted for Super Smash Bros but it's actually Cadence of Hyrule (though I wish it received more post-launch content).
Regardless of quality, a lot of first party Switch games are either re-heated ports (Mario Kart 8, Xenoblade Chronicles Definitive Edition, DKC:TF, etc), veeery slight upgrades over prior titles (Splatoon 2, Mario Maker 2 was in the category or even worse than its predecessor until the last few updates, now it's its own thing), or among the weakest entries in their franchises (Pokemon, Animal Crossing but updates might save this like SMM2, Odyessey, Three Houses, etc).
SSB Ultimate is one of the few franchise entries that feels like a pure better experience than previous entries, and ARMS and Ring Fit Adventure and Tetris 99 among the few new IPs or new experiences (where are they on the poll?). Lightly disappointed with Nintendo's Switch output actually.