The "Adcock style" quiver is very similar to the GFA.
While there will be slight variations in thematic design, the vast array of functional quivers are gonna be back, hip, bow, sling.
While all quivers are gonna be of these four basic styles, some may be combinations of styles, or convertible to different styles. Such as taking a bow quiver and sticking a strap on it and voila, ya gots yerself a sling quiver.
The GFA and Adcock and Indian plains and Torges quivers are all sling style quivers. A back quiver means just that - it rides somewhere off and close to the bowhunter/archer's back, and that kinda quiver style includes the Hill and St Charles Cat styles.
Everyone can jabber as much as they like about what quiver "works best" for them - emphasis on the word "them".
So, I highly recommend trying out as many of the four quiver styles as possible, and at least under simulated hunting test conditions.
At one point in time I borrowed a buncha different style quivers from my huntin' buds and spent a weekend frolicking in the woods with bow and arras all those quivers - sure taught me a lesson about what worked and didn't work,
for ME.
YMMV, but in reality it shouldn't.