I love any 26 caliber cartridge but I voted for the 6.5-06.
Here's my hunting pard and we're practicing at 950 yds with light rifles. He's shooting a 260 and I shoot a 6.5x284.
At distance, 700 yds and on, the extra powder in the 284 case seems to make a difference to us anyways.
He would have no problems killing a deer outright at that distance with the 260 though and neither would you.
His is a bit more pleasant to shoot.
One thing about the 6.5-284, it will give you the same as a 6.5-06 without necking down or up.
Redneck shooters here, practicing our art and science.