Well now, don't be too fast in adopting anyone else's truth as necessarily what might be the truth for you. It might be, but it might not.
I've owned 3 10 1/2" Super Blackhawks, and shot all 3 extensively in IHMSA metallic silhouette matches. Two were the original blued tapered barrel versions. The third was the later (1982 - ish?) stainless bull barrel version with the screw on front sight. I was very very pleased with all of them. I later had a T'SOB installed on the stainless version and scoped it for hunting, as well as did some other custom work to it.
Complaints about the SBH square back trigger guard are common. However, I love them, even when shooting full charge loads one handed from the Creedmore position. But I should say that I have a LOT of experience with the Supers. I've sold the 3 10 1/2" versions along the way, but I still have three 7 1/2" versions, once again 2 in stock blue form and 1 in stainless custom form. These have all been used in competetive shooting and hunting.
In fact, when I first began to acquire and shoot FA revolvers nearly 20 years ago, I HATED the FA grip, because I was so used to the Supers.
Now, FOR ME, a Pachmayr or Hogue rubber on a Super is a skin grabbing, blister causing pain machine, and I won't use one. That's my truth, not necessarily yours.
With regard to barrel lengths, I and every other competitor I knew found the extra sight radius of the 10 1/2" barrel to be an aid in hitting targets, particularly at longer ranges. That's why they were so popular in silhouette matches, before the dominance of the FA's.
I believe that the Ruger Super Blackhawk has been the best value in hunting and general shooting handguns for 50 years. The longer grip than that provided on the Blackhawk is an improvement for most people; however, people will argue about the square back trigger guard forever. You now know my opinion. ( The SBH Hunter of course has a round back trigger guard).
The Blackhawk 50th Anniversary Models like you now have uses the original XR3 gripframe, like a Colt SAA, rather than the later and slightly larger XR3 RED gripframe adopted later by Ruger. Why did Ruger use it again for the .357 and .44 Anniversaries as well as the Lipsey's .44 Specials ? Because people asked for them... for nostalgia, etc. Smooth wooden grips to replace the checkered plastic on the Anniversary Models are available from the Ruger website, by the way.
I suggest that you attempt to handle and shoot if possible, examples of both the 7 1/2" version and the 10 1/2" version to find what suits your personal taste. I have found both to be excellent.