Have had many over the years, and carried a New Haven .375 SS one at work for awhile. The “best” model 70 is a pre-war, and the only one I currently own. Second would be a post war pre-64 (and of course mean actual by date pre-64s, not the controlled round feed design alone). Which generally became more utilitarian the closer you get to 1964, but all still very well made.
I’ve never owned a push feed one though I did use a borrowed .30-06 push feed in Africa and it was just fine, certainly didn’t detract from my enjoyment of the hunting one bit. Though I didn’t feel the need to go buy one cheap after, I’d still choose it over similarly priced competition, but certainly not over a Ruger Mark II.
It’s academic as I’ve never heard of one falling off, but the major difference is the bolt handle with CRF Model 70s, on the pre-64s the bolt is a one piece forging. I learned from Dogleg years ago that the modern CRF Winchesters use a splined on bolt handle as a production cost savings. Again, minutia, as I’ve never heard of one failing though I’m sure it’s happened in an isolated incident somewhere on the web.
In closing, I liked the New Haven era of CRFs, the FN Portugals, the true Pre-64s, and the Pre-wars. From bottom to top in preference and build quality. I think the latest ones could be the best post-64 M70s, they remind me of Miroku quality. But I’d personally still take a New Haven over one, might be just a personal bias.
New Haven .375 out working, and Pre-war .257 cloverleaf tang (with stripper clip guide, neat feature).