If I want to be competitive on the bike and/or I am insistent at having excellent shift quality, I have to go with Di2 (or 7900). Nothing shifts with the slick smoothness of a Shimano gear train.

I've owned SRAM. Probably never again -- but only because of the clunky shift quality. Some call it "sure" shifting. Some call it "positive" shifting. I just call it clunky. I don't understand the "princess and the pea" ergo arguments. I've never met a hood I didn't like. For those who are more finicky, perhaps SRAM is the only hood they can stand.

But SOMEDAY, I will go with Campy. No good reason at all. Just because I must own a Campy gruppo someday.