I'd say split the difference and get the .257 Roberts Ackley.
Longer case life, Good velocity, very efficient. Put it in a 22" barrel with a little meat on it.
I had one done up in a 78 Sportsman Long action for my "Wyoming" rifle. Had Kimber detachable rings for a 6x Leupold to shoot 115 grain Partitions and a second 12Xleupold set up with detach rings sighted in with 75grain Sierra HP's for coyotes and PD. The 12x was a little too much for Coyotes, but just the ticket for PD.
Really, You can't go wrong with either one.
