I have yet to see that for any factory hunting loads I've ever compared between the two (Federal Accubonds, Nosler BTs, Hornady ELD-X Precision Hunter). I'm not a reloader so I couldn't comment on those loads. Luke knows far better than I do, I just haven't seen factory ammo that do either of those. They definitely do drift a little less so I stand corrected there.
HSM loads the VLDs for both (140s for the 6.5 and 150s for the 270, which do stabilize in the 1:10 twist) but doesn't post the drop charts. I just ran the numbers and, barring an error from me, the 270 holds a velocity advantage out to around 350 like Luke says, but holds the energy advantage out to about 800. Drops are the same essentially and at 400 yards the full value wind hold is only a quarter MOA less for the creedmoor.
Luke, are handloads that much better than factory loads for the creedmoor? Or maybe I'm not doing math right? Regardless, the short action, lighter weight, and less recoil of the 6.5 certainly hold an advantage if that's what you're looking for. I just haven't seen a ballistic advantage.
Like I said Luke knows far better than I do so take his advice, not mine.