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11 speed Ultegra vs 12 speed 105?
Both mechanical. Would probably look for a different off nice brand crank to pair with since I was already wary of bonding failures a year ago. The Ultegra set is older and readily available, and I expect cheaper than any price I could find for new 105. Has a nicer ring to it than 105 even though it's a very incremental step even within the same generation.
I'd say I prefer Ultegra for the availability for non-compact cranks. 34 small is just too spin-y, big jump to the 50 - and big rings just look better. Semi-compact is an improvement and currently run a 52-39 which like that a lot. But as mentioned ideally I would run a crank from outside the group anyway.