It all depends on your expectations. What I think.
1) Dependability, all that MB mentioned get an A.
2) Durability, " "
3) Accuracy, now that depends on your choice of options, and your willingness to work with what you buy.
a) free floated barrels tend to be more accurate, does not mean they are, but tend to be.
b) heavy barrels tend to be more accurate, but how much more? Once again, how much are you willing to work with your rifle?
c) barrel twist rate, and what you intend to shoot in your rifle? 55 grain, milsurp is not going to shoot really well in most rifles as far as accuracy, and by that I mean under an inch for 5 shots. But ammo go's way up from there, if your buying match type ammo, or building your own with premium bullets.
d) Les Baer is the only one that comes to mind with an accuracy guarantee, but I would expect dependability to go down, although, Les makes top notch stuff.
4) Accessorizing, they all take the same accessories, so take your pick, except for the gas piston guns, like the SIG, then you can have a folding stock, as the buffer tube is not used, but you will pay a premium for the rifle, not that it's not worth it, but is that feature worth it to YOU!!!
So like a 1911 or a small block Chevy, it's gonna run with what it was designed for, if you want more, you can fix it. You can fine tune it to your needs.