Think if I was buying a complete, I would go 853 as its a small overall increase and closer to the design Stanton wanted. I am not sure any 853 frame has 853 rear stays?
Without knowing the tube profiles (and I can't find those specs online) it's impossible to say if there is any discernable difference between them. All high-strength non-stainless steels have the same density and young's modulus.
Without knowing the tube profiles (and I can't find those specs online) it's impossible to say if there is any discernable difference between them. All high-strength non-stainless steels have the same density and young's modulus.