Di2

Once you learn how to set the system up it is quiet, rapid shifting, and allows you to make changes in how the mechanisms shift. Although I use them as a normal shifter, you can program them to calculate the next higher gear depending on your chain rings and cogset and using just the right lever it would shift all the way up through the gears and all the way down changing rings and cogs to get there.

The Campy EPS system is limited to 12 speed Super Record groups and they would run President Trump broke at about $4,000 for a group vs. Dura Ace Di2 at around $1,500. Or a little more for flat mount hydraulic disk setup with it.

The world is changing rapidly and people that don't want to keep up don't have to. The manual groups now shift FAR better than they used to and have longer lives and while Shimano doesn't really rebuild, they last so long that you wouldn't need to.