For myself (others may choose to differ!) the pre 64s feed much better/smoother, the safeties have been smoother/quieter, and when the actions close they "feel" like a good mauser/fn/bank vault (as opposed to a bolt inside a piece of pipe!). I tried to like the FN manufactured model 70s also but never did warm up to them (though the couple I had shot very well).
My experience is a bit different.
I judge feeding by the most difficult test I can imagine. Specifically, rifle vertical, muzzle down, work the action as SLOW as possible, virtually pushing the bolt forward not with a specific force, but with a specific slow speed. If the feeding is not truly controlled, then when the magazine releases the cartridge it will fall away from the bolt and into the chamber. If the feeding is truly controlled, by the time the magazine releases the cartridge it is already held by the extractor. You must try this with a full magazine, feeding with different tensions and from both sides. I know my New Haven Classic .300 Win Mag is good, as is my Pre '64 .270. If I recall correctly, my New Haven Classic Featherweight .270 is fine too. Bottom line, they all feed well for me.
I have found Pre '64 safeties to behave all manner of different ways as far as smoothness, noise, and when/how they release. I don't know if this is due to hand fitting at the factory, or subsequent work after leaving the factory. The New Haven guns are a little louder than some, but plenty smooth, positive, and consistent. I attribute this to CNC machining, and (sigh!) MIM consistent parts.
Here is an interesting test. Cock the rifle, but the safety in the "middle" position, raise the bolt handle slightly, then see if you can flip the safety lever to fire. In my experience, some Pre '64 will allow this, some will not, and newer rifles almost never will. Older Winchester instructions were to put the safety in the middle position to make it easy to manipulate "when action was imminent." But as your trigger finger is outside the guard, your trigger finger knuckle nearest your hand might move the bolt handle up a bit. One might think this would lead to the dangerous condition of the rifle firing on a less than closed bolt. But you will find that if you can get that particular safety off and pull the trigger, as the firing pin moves forward, it closes the bolt. However, this might take enough energy from the firing pin to cause the primer to not ignite. Not good. One the other hand, there was a lady a few years ago how got beat up pretty badly by a Cape Buffalo. Her husband was using a newer M70, had the safety in the middle position, inadvertently raised the bolt a bit, and couldn't disengage the safety. (At least that seems to be what happened based on how the account read.) He eventually figured it out and shot the buff right between the eyes, but not before his wife took a beating. I don't remember where the PH was during all this. So, either way this test works on your rifle, it seems a poor idea to me to ever have the safety in the middle position "when action is imminent."
I don't notice much difference in "bank vault" closing, but maybe I am not discriminating enough.
So, I like all my M70's. But maybe I got lucky on the chambering choices, vintage, or individual rifles. I avoided the push feed rifles, so all of mine are controlled feed. Admittedly my sample size is small. But I tend to mess with the safety action and the "bolt handle test" on any M70 I handle, so I have more confidence in those comments. Obviously, I cannot test all of them for feeding.
Best,
Gun Doc