How are you planning to be "competitive (informally)" while avoiding drafting?
I think you may have gotten lost on the way to
https://www.bikeforums.net/triathlon/ .
Or are you talking about dropping other people who don't know they're in a competition with you (i.e., Cat 6 racing) so you can give them a look as you cruise by? Then it all depends on whether you plan to do the majority of that on the flats or on sustained 4+% grades. But then equipment choices like wheel depth are going to make a lot more of a difference than frame. That's talking bike-specific equipment only, as I'm assuming you'll be riding in a skinsuit with an aero helmet and socks already.