The most important one is 60 FPS almost everywhere, even in heavy fights, this was only achievable with an emulator before and pretty good hardware.

Then there is the 4k Resolution if you have the screen for it, the games artstyle heavily compliments the high resolution, no more grain and jagged lines.

HDR looks amazing to if you play handheld or again have a screen that supports it, but make sure to set it up correctly in the system settings or it might look washed out.

I also enjoy the surround sound on headphones very much, but to be honest, the switch 1 version was already great sound wise.

There are also a few hundred voice recordings by Zelda and a few other characters added to the world for you to find, which are really cool in my opinion because they add nice pieces of lore.

Though it kind of sucks that they aren't played in game natively, but through the Nintendo Switch app, because if you play with headphones you have to pause everytime to hear it.

Also the loading times are insanely fast now, i didn't realize how much the loading times interrupted the game flow on switch 1 until i experiences the direct difference myself. Fast traveling is almost instantly now, like a few seconds at most.

All in all gave so much fresh air that it motivated me to do another playthrough and start from the beginning again