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SRAM? Don't know enough about it to dismiss it totally but I already have plenty of experience with Di2 and know it works well, have existing parts for Di2 and I don't need to be carrying MORE spare batteries for a ride and their charging dock. I feel dirty enough just using one of their cassettes...
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I much prefer eTap to Di2, it works a treat and is so easy to setup. Only had one battery mishap so far, when I rode the bike for the first time in over a month and the front derailleur battery was flat. Have been running it for nearly two years now and still haven’t had to change the shifter batteries.
If only there was some system available which didn't need wires and mounted the battery directly on the dérailleur...