OK, my opinion. Of the 3 brands only, I would take the Winchester. Why? I have always had a warm spot for Winchester anything. M70's, Lever guns, M12 and M101 shotguns.
As for the M70, its safety design is by far the best, the trigger is relatively easy for the end user to safely adjust and of all the M70s I have owned, I've NEVER had a clunker in terms of function or accuracy. Great, solid good fitting rifles and worth the price tag. Winchester also has always been out there (with Remington) bringing new ctgs to the market. Some have been tremendous long term winners, some have not. Of the 3, my money walks 1st to Winchester's corner.
2nd Choice; Remington. Good solid rifle for the most part. Most I have owned, shot or seen were also accurate. My personal bias against Remington products (but not necessarily the 700) is that over the years they have come out with some really clunkly and ugly designs in hopes that one of these "built to the lowest possible scale" designs will be a hit. They never have been. The model 700 came to being as an exercise of reducing manufacturing costs and ironically, it was a hit while the post-64 M70 was lambasted for years. My own personal bias against the 700 is the fact that the bolt starts out as 2 pieces: bolt body and bolt handle. The handle is then either brazed or welded on, and infrequently that weld has failed, leaving a bolt handle in the hands of a bewildered shooter.
3rd Choice; Ruger. Just have never really like Ruger's stuff and especially never liked Bill Ruger's politics. The one Ruger design I do however enthusiastically endorse is the 10/22.......got to be the best, most rugged .22 semi EVER designed. My personal bias against Ruger products is the fact that EVERYTHING that goes into one of their guns that can be made from a casting, is a cast piece. Receivers, bolts, frames, etc. you name it, pretty much everything in any Ruger firearm is a cast piece except the bbl. While other manufacturers are utilizing a machined forging for a particular piece, Ruger will use a casting. Ever wonder why some Ruger firearm/parts designs look beefy? They have to, to net the same strength because of the way the part is produced. May not bother a lot of people, it does me and because of Bill senior's support for the 1994 AWB, my money goes elsewhere.
Just my opinion.