I am leaning toward the .454 Casull since I have a Ruger Super Blackhawk Bisley in .480 Ruger with a 4 5/8” barrel that is my perfect packing pistol. It is probably close enough to the Linebaugh to make it superfluous. This will be a hunting gun for deer and pigs. I also have a Reeder Ruger in .410 GNR which is a .454 Casull necked down to .41 so it would use common brass, which I have a bunch of.
With that additional info, I'd go with the 454. I have the Bisley 480 in both barrel lengths but prefer the 4 5/8. An optic on the longer barrel 454 for hunting and open sights on the shorter barrel 480 makes a lot of sense to me.
