Your building not buying? At the end of the day it's all about bullets, and those are changing all the time. To keep recoil down you'll look at lighter bullets, opposing that is heavy for caliber generally fly better, and penetrate better given similar construction.
The heavier bullets in 6.5 appeal to me more than the others. 140-160, is going to give less recoil than 180-195.
Those stating a preference, and qualifying it with a particular twist are on the correct track in my opinion.
Bullets are getting longer, heavier, made of different materials, with fewer gaps in the lineup, and can be custom ordered more readily than ever. I wouldn't normally even consider the 270's, or a .264 Win Mag in the past, the ability to truly order, barrels and bullets to your individual needs make them legitimately on the list.
I picked the .264, but any of those listed are viable choices, and I'd rather have the opportunity to tailor the barrel/bullets to my needs, than choose between them.