Might be personal, as I have not trained with a lot of people. In the group of shooters I run around with, everyone agrees that it is faster to dial than to find your place in a holdover reticle. I don't believe anyone of us has won a national level match, but I believe we have all placed top 15 or better, and all of us have won regional level matches. In my personal experience it is faster and less likely to cause an error when dialing vs holding over. We all practice both methods extensively because of the forced "no dial" stages.
There is the perception among people that only train one method, or those that don't train enough, that holding is faster, but my personal experience does not support this.