Both are great, though, and the rapid speed of development on both projects means that whatever impressions I formed earlier this year are likely already out of date!
https://yuzu-emu.org/entry/yuzu-android/
On desktop at least it has an early access programme via patreon (but available here https://pineappleea.github.io/ )
Skyline runs on Android but I've never managed to get it to work on any device. It's no longer in development
Source: researching this about 3 months ago to see if I could play BotW on my S21 FE. I can't.
Also Yuzu has asynchronous gpu shader building which means you don't need to find and download a pre-built shader cache for a game for it to run smooth. Yuzu can build itself a shader cache while playing and it doesn't cause the game to stutter and hitch like crazy.
Yuzu just seems to me to be the technically superior option at this time.