Nosler houses pa-cnor tubes
So the Nosler gets points from the OP on the trigger (Timney), and as Fotis pointed out has a PacNor barrel.
And JB has explained that the Nosler action is factory blueprinted, like a 700 clone action people pay a grand for.
The Nosler is probably lighter, and it is Cerakoted.
The Nosler is made in the USA, and the Winchester is made in Portugal.
And both the Nosler and M70 Extreme have a stock that
some people find a little thick in the wrist (I do not).
Unless the price drove me to, I don't know why I would buy the Winchester. The Nosler can often be found for just a few hundred more.
