I do think the cool thing with the choptima is the ability to do sm or bm on the same unit very easily. Much like I find being able to do sm or bm on the fathom to be pretty easy to go back and forth with, though the choptima definitely makes it a little easier.
I definitely enjoyed the ability with the Choptima to effortlessly change between BM and SM. However, I really just didn't enjoy the cluttered chest aspect after diving in various configurations and environments. Also, with bigger doubles (like my 85s) I just felt very "tall" in the water. I ended up selling the Choptima recently since it wasn't getting enough use to justify owning it. So now I am on the hunt for my next unit and the Fathom checks a lot of boxes.I've slowly been falling out of love with sm bailout. I'm happy I chose my fathom over something else since I can easily do either. SM bailout is great, but when you start adding multiple stages BM is easier.
Out of curiosity, are you cave diving your Fathom in a BM configuration with the 50s? Or primarily ocean diving with the 50s?