Dollars before performance
SRAM is really good, super-light, robust and "ergo". But Bjarne would only change for money, lots of money.
And, it's true that SexyBank had always been a team that went their own way, equipment-wise, but they went to Cervelo and their gear partners last year and asked for three time more money than before, (thinking that they were worth it now that they had won the Tour). Specialized happily ponied up and Cervelo et. al. put their sponsor monies together into their own team, which has proven to be a really good decision.
And lastly, some teams have struggled to get on terms with DuraAce 7900. I saw a lot of torn off rear derrs and chain issues this year. If you are running this stuff, please,please set the chain length correctly and install the complex joining link as instructed. ( And the Campy 11 folks, you too have to use the proper new tool, and follow the very specific instructions, or you will face plant too ).
Pay attention to mechanical issues in the races, most of he time, it's the quality of the mechanics, but a pattern emerges eventually, pointing out weaknesses. ( Back in the day, CSC would glue up new Zipps every race, 'cause the tubular rims weren't holding up. They fixed that by making them heavier two years ago)