Either the Remington or Ruger will be flat shooting rifles in .22-250. If doing any calling/hiking then weight would be the next factor to consider if carrying them for any distance.
There will be much more for aftermarket support with the Remington SPS (triggers, stocks, etc) since that has the model 700 action and one of the most popular rifle actions out there. If you decide to tweak the rifle at all down the line that is (suggest you consider a Triggertech Primary trigger if you go the Remington route. Much, much better over the factory trigger! Adjustable from 1.5-4lbs and no creep, like a glass rod snapping!)
If you go with good glass on the Montana, that is always a good investment.
You have a tough decision, you have good platforms to work with either way and flat shooting calibers that have readily available ammo in many weights if buying off the shelf. Let us know what you decide!