That's hard to say. I can see an aero frame being beneficial in breakaways (or when playing catch up), but considering aero frames generally weigh more I would prefer something more lightweight for the constant and fast accelerations riding in the pack, especially out of corners, etc.
Of course the differences aero vs. weight are probably pretty negligible anyways, in which case running a more tri-like geometry would probably be more beneficial when it comes to the run.