I have set up many Di2 and SRAM wireless bikes and will say electronic shifting is a nice luxury. Between the two, and as much as I dislike tap-tap shifting and SRAM hydro brakes because they are finicky, the SRAM wireless is what I prefer. My son, not a mechanical wizard by any stretch, installed and set up the SRAM wireless himself without any need to call me. It is simply simple to set up, much less fidgety than initial setup of Di2. I also like the way the front der shifts using the left and right shift buttons together. For some reason it makes sense. What I like most of all is the fact that there are no wires to route anywhere, each servo motor has its own battery, and the battery is interchangeable between front and rear der.

With all that said, my personal bikes use mechanical shifting. It works really well, has been around for a very long time, and does not require charging. Ever. Campagnolo 11 speed is my personal choice, but I do have a touring bike with a mix of Shimano and Suntour drive parts, which work flawlessly together because it is friction shifting!