Overall, both of those options will be quite similar. I would go for whatever is cheaper or has better timings for you.

Look at it this way: Car fans could debate between Mercedes Benz and BMW all day long. But if you have been driving on old Chevy for years, both MB and BMW would be a huge upgrade and seem pretty similar to you. I would just add that I wouldn't expect too much service wise on domestic F anymore. Priority checkin/security/boarding, a better seat and maybe a meal is about all you get. Much better than Y, but not that amazing.