I would miss the ability to multitask by split screening apps or doing floating app with my S23U. I would miss my spen which I use to take quick notes, and then can slot back into the phone which even the iPad Pros can't do. I would miss having a non Safari browser like Firefox and its addons. I would miss the easy access to foss apps like NewPipe, and apps not allowed on the Apple store like tachiyomi, emulators, and torrent clients. I would miss that syncthing type apps don't properly work for syncing across different platforms. I would miss the launcher, since I'm not a fan of Apple launcher and app library aesthetics. I would miss the Android folder system's easy access to everything in there compared to the iPhone. I would miss one hand operation+ method of navigating over Apple gestures.
I would like the long term updates of the iPhone though. Using the iPad though made me never want to get an iPhone.