From everything I played, Odyssey is easy my #1 then BotW.
Third would be Mario + Rabbids Kingdom Battle, just like Odyssey and BotW, is a game packed with so much love and charm, tight and challenging with Kirkhope at his best with the soundtrack.
And a special mention to ARMS, I may suck at it, but is another title I find pretty great. Those would be the highlights of my year with the Switch.