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There was a lot of discussion about this on the CTC forums; there's a lot out there if you search, but there's this monster thread in particular: https://forum.cyclinguk.org/viewtopic.php?f=5&t=64432
IIRC the TL;DR is that the A8 is mostly found to be more durable/reliable than the A11, and that in grotty UK weather conditions, both may well benefit from better lubrication than the factory setup provides.
Anyone got any experience or knowledge of durability and longevity difference between alfine 8 versus alfine 11?