I'd take the Buffalo hands down from personal preference, but AGE because of the market expectation the prices are higher - make money on the premium. That's if they were the same price.
I like both and will probably pick up one of each at some point. Don't see em coming up on SS very often though (in 1 oz variety at least).
In my area, Buffalo is slightly cheaper but it's 9999. About one year ago, Buffalo was higher. Puzzling