I just switched from iOS to GrapheneOS, and it's amazing. I'm not sure how much of it is just basic android features that are just missing in iOS and how much is specificly Graphene OS, but either way I'm loving it. Some of my favorite features are the following:

1. Apps that are actually good, such as firefox actually working well, the tor browser, syncthing, and termux.
2. No bloatware, at least with GrapheneOS.
3. The wifi/bluetooth doesn't randomly turn back on when I turn it off in the quick menu.
4. Different users so I can seperate all of my accounts.
5. Easy sideloading with APKs and alternate app stores.(I don't even have the google play store on my main profile)

I could go on and on, but I don't miss iOS one bit.