I have both, di2 on my outdoor bike and mechanical on my indoor trainer bike. I prefer electronic- I upgraded a Tarmac SL6 myself with di2 by watching Youtube videos. For me the biggest upside is the lower maintenance requirements (indexing gears) and switching gears under load. Will it make you faster? I doubt it, my climbing (lighter components) and short sprints numbers are better (I have a remote switch) but that’s about it.
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