Used 1 x 11 all year, I’d say wear rate is better because most of the time I have a better chain line than my XTR 3×9. Changing chains on 1×11 is super simple too with the added rear mech lock. Had same casette on all year and on third chain. If you select the right ring up front you get very good chain casette wear as your mainly in the middle gears. Those complaining about wearing out the 42t casette ring have been running to big a ring up front. I use a 32t, started with a 34t which is fine but smaller is better for overal performance. This year included 1170km Trans Portugal, four day Stage race Poland, Enduros UK, long Mynd, Wales trail centres as well as a superb summer of dry trails. So I think the cassette had a good thrashing and theirs still I think another chains life in it. A lot of speculation above based on zero long term experience