Originally Posted by
ArchEtech
If etap is truly wireless, and I was upgrading just the groupp I would lean towards that system because it would be much easier to transfer to a future bike. I don't have any experience with them to understand the +/- of shimano vs. sram electronic shifting though other than that.
etap is truly wireless, which is nice. Di2’s advantage is that you only have to worry about one battery - and it lasts a long time on a charge.