I suppose you dual boot them because postmarketOS isn’t usable as a daily driver right ?
I liked Sailfish UI a lot, and the fact it was a “standard” Linux with coreutils, git, rsync, etc… by default was the main reason I switched to it. But yeah, I’ve been quite deceived by their recent “updates”. I now have an Xperia 10 III, but there doesn’t seem to be much custom ROMs that support it unfortunately (which is also why sailfish support isn’t great anyway).