Yeah, you seem to be taking being wrong very well.
I legit don't know. Odyssey is better than Sunshine on almost every points.
Style? Uuuhh, if you like beaches and luxurious islands then Sunshine is for you? With Odyssey, you go from some strange dark Tim-Burtonesque village to a big steampunk structure designed to grow vegetation. Did I mention New Donk City which has the balls to introduce detailed humans in the game? Or Mount Volbono, a delightfully colorful volcano themed around food? How about a Japanese styled temple serving as Bowser's castle?
Moves? In Sunshine, Mario has a pretty good number of moves that all have their interesting roles with FLUDD, I won't deny it. Yoshi seemed interesting but it just felt under exploited to me. Odyssey is just magnificient in that regard. The combinations that can be done with Cappy are endless. You can jump on him, re-throw him to gain some momentum, and do a long jump to hop on an incredibly far platform. You can also make Cappy spin around you, and oh shit did I forget something? Ah yes, the transformations. They just add so much to the gameplay it's unbelievable.
Now what about game design? It's awful in Sunshine. Like really. Remember that stupid Manta ray boss? The awkward platforming under Pianta village? The areas where all cramped and unsatisfying. The actually really good platforming sections where the FLUDD-less levels and they where 5% of the game. It's like the employees where forced to create dumb missions to exploit the maps at their maximum ( the watermelon contest is one of the worst challenges in any Mario game period ). And when they tried something different, like the sand bird, it just was unfair and frustrating. Odyssey fixed all of this with a fuckton of hidden door and rocket levels. The main worlds also always felt pleasing to explore and not cramped, it just felt like it was spacious enough to get the player as concentrated as possible on the platforming.
Don't get me started on the camera.
As for the music, it's subjective and I admet that I remember more Sunshine tunes.
Oh, and Sunshine's cutscenes where horrible, especially the one with Bowser talking to his son. It's so awkward.