Okay, end results are in! Lol. One thing I didn't think about though was that I conducted my experiment on black bags (and 1 gray) which would not account for any darkening of the leather the various products might produce... I think I will have to do this again! I'm such a dork.
Anyway, here are the bags, sans hardware still and with one coat of each product. I think I'll do a second coat on them since they were all super dry. Y'all, I gotta say, I like them all! I used the same method with each, warming the oils by rubbing my palms together until quite warm and rubbing into the bag also until heat was generated. I used a drier afterward very carefully because I'd never done it before. I'm not sure I even got close enough to have an effect. I was a bit nervous.
In application I prefer the spreadability of Renapur and Obenauf's, but I feel like all the bags came out pretty shiny. The BR might be the best in terms of shine though. Here are pics of each bag with the products used.
Very scientific, they look great!