Given that HTD is at this point a de-facto standard while GT2 is a proprietary profile*, I don't think a lot of belt manufacturers would want to go on the record with an unbiased recommendation. Gates is going to say that GT2 is the way to go, while everyone else will say HTD.
In reality, a wise designer would probably want to have enough of a safety margin that either profile would not ratchet.
* A brief Google search couldn't confirm or deny this, but it is my recollection. I'm sure that CD will correct my statement if it is incorrect
