I own all 3 brands. A Badlands (older model ultra or superday, I believe), a BisonGear Lemhi, and an Eberlestock X2.
Have carried all 3 on many days of elk hunting, covering many miles with varying size loads.
Here's my take (though packs fit everybody differently)
Badlands- good pack, nice pocket arrangement. padding is right on back, so can cause back to sweat easily when climbing hills, doesn't carry as large of load as I sometimes like to have.
Bison Gear- has been my go to pack for years, wool-very silent, I deal with snow more than rain so waterproof is not as big of deal as in some parts of the country, frame stays support the load against the back very well (can get a little warm at times), but heavier loads tend to cause the pack to kind of sag down toward the bottom (if that makes sense). I guess not enough compression straps to lift the load up.
Eberlestock X2- new this year. Extremely comfortable even on the first trip out. Plenty of pockets, mesh back and small external frame keeps room between back and pack for ventilation, carries a heavy load well (the lower compression shelf really lifts the load and keeps it tight), Material gets a little noisy as temperatures approach 0 degrees.
Sorry this was so lengthy, but I wanted to state my findings.
If I had to get rid of all but one pack today, the one I would keep would be the X2. For me and my type of hunting it is the most versatile. Good luck on finding the right pack for you.