as has been stated,..the rem700 action is a superb platform for a build-up and the sako is a great "as is" rifle. That being said,..and heavy barreled rem after being trued up, and having the action face squared, lug shoulder squared, skim bedded etc will shoot every bit as well as a sako (at least mine do). Now,..at which point have you spent more money to get the same groups? that is the deciding factor. I got my sako L691 actions NIB in the white, for $350each, so they were a considerable deal,..but I can't see my buying a new sako when I can start with a used 700rem action and skip the barrel I am going to toss away anyhow. Even a sako barrel wouldn't remain on my customs,...there are too many better barrels than factory barrels.
If you want to get in cheaper,..the heavy 700rems are the benchmark. If you want to get a shooter with little or no tweaking, you may wish to stay with sako. If you plan on consulting a LR gunsmith,..then go rem700 (cheaper aftermarket parts and more of them)
JMHO