Handsdown, Winchester. I have 4 current manufacture M70s, and all four are very accurate:
Ultimate Shadow .243 Win
Stealth .22-250 Rem
Stealth .308 Win
Super Grade .270 Win
In fair disclosure, my first Super Grade in .30-06 Sprg was defective, but Winchester backed me well. Yes, I have owned a Sako, I think it was a Finnbear. It was chambered in .270 Win, and very very accurate. However, the laminated stock cracked. One day I was testing some handloads. It blew a primer, and that "blow-torched" the bolt face. Steel that soft is not for me. So, I stuck now with Weatherby rifles, and current manufacture Winchesters.
JMHO,
Geno