My last 2 (non-BMW) cars had sport seats. When I test drove I did NOT like the non sport seats and ordered the sport line just so I can get the sport seats. My car isn't here for another week but I'm already glad I ordered them.
Having said that, I think if I wasn't used to the sport seats already I probably wouldn't miss them. ? As others have said seat comfort is very subjective. It's hard to make recommendations for other people. Just make sure you test out both options before ordering/purchasing!