I have never tried Shimano Di2 or Campagnolo EPS. However, when I decided to go with electronic shifting I faced the same question. For me, however, it was a no-brainer. I went with SRAM Force eTap AXS. Why?
- It's not Shimano. Not that I have anything against Shimano but all I've really used has been Shimano and I wanted something entirely different.
- It's not Campagnolo. I've had too many problems with Campy parts failing and being unreliable.
- There are no wires!
- There are no junction boxes or batteries in inconvenient places
- It's easy to stow an extra battery in your pocket or saddle bag.
- The shifting is very intuitive, left goes up, right goes down, both move the front.
- The Shimano paddles looked too small and seemed like they would be clumsy to shift in the winter with thick gloves.
What I don't like about the SRAM Force eTap AXS groupset:
- The graphics. Ugly and garrish.
- Limited choice of chainring sizes.
- Front shifting feels a little slow.