I think SRAM take the lead on the OEM market because their lead times are much shorter- weeks vs months, their payment terms are much more generous and they seldom/ if ever fail to deliver what you order. Throw in a level of OEM customer support and service that is simply the best out there and it’s no surprise they are doing so well these days.
There’s nothing to choose between the performance of the products ultimately other than one or two headline features for either brand.
More price competition is good for customers, good for us all.