Which Groupset?

all the recent winners have been on SRAM because they are making a huge push for the road market so are sponsoring as many pro teams as possible. The manufacturer of the groupset is utterly irrelevant at that level.

It's a meaningless statistic - teams will ride whatever they get paid to ride

Yes the answer is very short. To fill 4 pages we need ample amounts of BS.

The answer...

Anyway, all three companies make quality groupsets so try them all out and go for the one with the shifting levers that work best for you.