If we are talking about a bench gun here, why does the accu-trigger matter? All my "range only" bench guns get triggers sub 1lb pulls. The only factory trigger out there that can do that is a CZ Set trigger. I think it's safe to say that if you got a Savage, or if you got a Remington you would probably be replacing the trigger.
That being said I would go with a Remington for reasons already stated. The aftermarket parts. Half the fun of owning a gun is adding in aftermarket parts to the gun (triggers/firing pin assy's/bipods/ect).
I would love to own a savage, except for one thing. I just can't bring myself to like the way the action feels (petty when it comes to bench shooting) and I can't stand the way they look. I know it's a BS complaint, but if I'm going to drop 800-900 on the rifle alone I've got to like the way it looks, and I can't stand the look of the Savage safety. I do have a buddy who purchased 2 savage rifles this year, and they shoot very well. I don't think you're going to get a bad rifle with any make you choose.
As for the HS Precision and McMillan debate, it's kind of like asking do you want to drive a Porsche (HSP) or a Ferrari(McMillan). Both are top notch stocks. As far as accuracy I think they would be about the same after you skim the top with glass bedding to add that perfect fit. I've shot off McMillans and they are nicer feeling stocks, there is no doubt about it, and everyone will know you're shooting somthing serious when you show up with a McMillan, however in reality I don't think you loose that much when you shoot off an HSP platform.
Barrel change will be easier with a Savage, but if you're going to re-barrel why on earth would you pick a factory barrel? You save a hundred dollars or so, but think of the gun you would have with a Krieger, Shilen, Lilja or Hart barrel on either of these guns.
I'm a Rem guy so take it for what it's worth. (not much)
Edit: I'll throw in a pic of my Rem 700. Not a PSS, but a Sendero. It's the same thing without the extra sling stud. Mine is chambered in .300 Ultra.