I gave up on Apple Music after 3 years and moved back to Spotify a month ago.

Apple Music pros:

• really good UI (including light/dark mode)
• spatial & lossless audio
• included in Apple One subscription

Apple Music cons:

• no crossfade (still! In 2023!) - useless for parties
• thinks I want to listen to my Christmas playlist in June
• generally terrible music suggestion compared to Spotify
• no ‘playlist radio’ (again, compared to Spotify)
• music discovery massively sub-par compared to Spotify

iPhone’s don’t use RCS, so AFAIK, no they can’t. When an Android messages an iPhone, the iPhone falls back to sms which does not support reactions.