Packs are kind of like boots, buy what fits you well. With the exception of the Exo packs, I have worn them all and most have some very strong features that make them fit a particular body type well or a certain style of hunting well.
For instance, the F1 Mainframe from Eberlestock fits Dan Pickar very well, but Brian Barney and I preferred the Big Top or the V90 Battleship. One brand with several backpacks that fit a VARIETY of bodies.
Mystery Ranch fits me well and the Metcalf is a pack that has done a lot of heavy lifting for me. Others in the office liked bat-wing style belts more than the Mystery Ranch style. However, you won't break a Mystery Ranch Pack, I have tried and was unsuccessful.
Stone Glacier is another pack that has some specific features that many want, number one being a very light starting weight. Several of us here have tested these, never broke them and they fit a variety of body types well too.
Bottom line, it's worth testing a few out, keeping receipts, sending back the ones that you liked less. Chances are that you will like a bunch of them but will probably find the one that fits you really well and that will be what ends up staying.