I've seen a bunch of people say that Metroid Prime Remastered is the prettiest game on the Switch, and while I'm not sure I'd go that far, I do still think that it is a looker!
Artstyle-wise, I think I do still prefer other games on the Switch like the Zelda BotW Trilogy (aka Breath of the Wild, Age of Calamity and Tears of the Kingdom), Mario Odyssey, and the Zelda Link's Awakening & Advance Wars 1+2 Remakes (I love that "small plastic figurines" aesthetic!!!!)
But there's certainly no denying that Retro Studios did an amazing job with taking the visuals of the GameCube version (which at the time were really impressive, and even nowadays they still hold up pretty well!), and giving it a thorough facelift!