For me it's the features I mentioned above - having a CLI on desktop, and both ios and android apps is so huge because I have devices in all three ecosystems! One password manager that works seamlessly across devices is very appealing to me. The Bitwarden mobile experience needs a lot of polish, if Enpass is better I would switch.
Bitwarden has a CLI also, both the official bw-cli and the nicer rbw. Can't speak for iOS but on Android bitwarden plugs into the OS password manager autofill API, same as everyone else, don't see why enpass would have a different experience.
Well, that's what I want to find out! Very rarely does autofill work for me on Bitwarden mobile - 80% of the time I have to open the app, copy, and paste my info. Not good password field recognition, and it's a regular friction point for me.