Greetings,

My experience is primarily with SRAM Force and Red groupsets. There is one difference between Force and Red that can have an effect on longevity and that is the type of bearings used. With SRAM Red, ceramic bearings are used more often. They are used in the bottom bracket and in the jockey wheels of the rear derailleur. With SRAM Force, steel bearings are used throughout.

If current Shimano Dura Ace groupsets use ceramic bearings also, they will require more frequent maintenance and they can wear out quicker than the cheaper groupsets with all-steel bearings. This may seem counter-intuitive but it happens this way because most bicycle ceramic bearings still use steel races. When ceramic bearings are used with steel races, the much-harder ceramic balls can score the races more quickly than steel balls if any dirt gets into them. So you have to clean and regrease the ceramic bearings more frequently than steel bearings. Failure to do this can result in the bearings of the higher-quality groupset wearing out before the lower-quality groupset. And ceramic bearings are not cheap to replace!

Like I said above, I don't know if a similar situation exists with Shimano groupsets. But if it does, Dura Ace will probably wear out before Ultegra or 105 if Dura Ace uses ceramic bearings and they are not serviced as frequently as required.

Kind regards, RoadLight