Packs are a very personal thing and just about everyone has their own favorites. The brands that keep coming to the top are all excellent by reputation and all of them should do the basic job (carrying your gear in and out, hopefully with lots of meat on the way out). I limited myself to good brands, and then tried the packs on. I want something that fits well and can put around 75% of the weight on my hips as my first check box. The second check box is that the pack has the features that I want (rifle/bow carry system I like, pockets well organized/sized for my gear, things like that). I won't buy a pack that I can't try on in the store, and preferably try with some added sandbags for weight.
I have an Eberlestock Just-One that I use for hunting and it works well for me, but that doesn't mean that it will work for everyone. For regular backpacking, I have an Osprey Atmos 50, and I have a Gregory Zulu 35 as the daypack that I use for work. I use the same criteria to pick those packs too. That Atmos 50 is extremely comfortable, and if it wasn't orange I would consider mounting a rifle scabbard and using that for hunting too.
Basically, decide what your specific needs and criteria out there, then find a pack that meets them. All of the brands mentioned in this thread make good quality packs, so if you are looking at them it is just a matter of finding one that works for you.