The current Force vs the Current Red comes down to weight and zero loss. Ceramics just ARE a gimmick. Zero loss, from what I've heard, is worth it. It's definitely common to see all Force builds with Red shifters in order to get ZL.

The next generation of Red adds quite a lot in terms of front shifting, etc. If you can afford it, that's probably what I'd get. FWIW, I ride an all Force Scott and love it.