Originally Posted by
Rock71
I have the 105 10spd and love it. I recently rode a new bike with the Di2 and would not blame you for that upgrade. Its your bike bro, so make it your own.
5800 is much better than 5600 or 5700, but Di2 is in a different league.
If the $$$ isn’t a huge factor, I’d go with Di2. A few months ago my 9000 equipped bike was stolen, and I replaced it with 9070 Di2. Mechanical Dura-Ace is great, but the Di2 version works better.