A few years back at a gun show in rural northern Arizona I got a chance to fondle a variety of classic SA wheelguns and compare them to my NewVaq which was (and still is) wearing an SBH hammer.
When I cock a single action I do so strong-side-thumb, when shooting one-handed or two. I want to put the tip of the hammer right into the joint in my thumb, dead smack on. That way I can fold my thumb over the hammer and push it down from above, rather than dragging the hammer down from below with friction on the middle area of my thumb-pad. I do not consider the latter a reliable method of cocking. On my gun the SBH hammer put the tip of the hammer exactly where I need it, on the joint, while doing my preferred pinkie-under hold.
A pair of post-WW2 Colt SAAs put the hammer's tip too high - up on the pad of my thumb. Two Uberties and a Pietta, same deal...as did my New Vaquero in stock form of course.
A bone-stock USFA Rodeo put it in the right place - at the joint. As did all three pre-WW2 Colt SAAs available for testing, including one with a black powder frame (pre-1895).
From this limited testing it appears to me that Uberti, Pietta and Ruger are cloning the hammer reach feel of the post-WW2 Colts. USFA cloned the pre-war feel. And then you graft an SBH hammer onto a NewVaq or other mid-frame Ruger, you get the pre-war feel as well. The result may not "look period correct" but in terms of functionality it is (surprisingly!) the SBH hammer that allows you to use shooting techniques correct to the Old West period including "thumb fully over hammer" as endorsed in writing by Bat Masterson, a former buffalo poacher (and criminal at Adobe Walls) who used to have in his employ while police chief in Dodge City Kansas one Wyatt Earp.