Di2 all the way. The only advantage to wireless is during the initial build and so that only helps a very small group of riders which are those people who buy bare frames and build bike up themselves. I normally buy my bikes built so no advantage fo me.
Four separate batteries compared to one is an advantage in my eyes.
Another advantage in Shimano’s camp is the shadow derailleur design which prevents damage to the system if you drop your bike.
SRAM disc brakes are a pain to keep centered and Shimano is leagues ahead in this area.
Last edited by Atlas Shrugged; 01-27-21 at 07:19 PM.