I've only played a few games of each edition. I've never used the gunfight rules from either version - Native Americans seldom went in for such nonsense. Blaze of Glory is a bigger Toolbox with lots of rules that aren't needed until you need them. For instance, you don't need the rules for wagons and/or stage coaches until you have a character (Big Foot Wallace of all people) driving the mail run between San Antonio & El Paso & has to pull into the abandoned stage station at Van Horn's Well with a group of tin horns to fight off a band of Indians.
On the other hand, Devil's Elbow plays much quicker. I used it to play the engagements of 8th Cav at Difficult Canyon & 6th Cav at Paint Creek. Both of these engagements involved small detachments & small bands of Indians.
I like both games, but they do bog down with a really large number of figures. I played the battle of Peno Creek when Blaze of Glory first came out & it took forever to play. I've found that the larger battles between the army & Native Americans are best played using Colonial Adventures. But that's another topic.
Before COVID hit, I was planning a road trip up into the Texas Panhandle to visit the Ghost Town of Tascosa & visit Moteetie (where the Sweetwater encampment was located). Since the Big Fight at Tsscosa involves several buildings, Blaze of Glory might be the best fit for it, but still doable using Devil's Elbow. For the gunfight at Sweetwater between Bat Masterson & Sgt. King's bunch, I think Devil's Elbow is the best fit.
Amado mio, love me forever and let forever begin tonight.