I can't comment on the other packs -- but I have the 'military' version of the J107 in OD green. It has the 1000 denier and a "wider scabbard" option, which I got, to accommodate big scope + bipod. I really like it. I got the kit for the military version, which comes with two hydration bladders, a spike duffel, and the rain cover. Works great for me.
IIRC, one big difference between the two packs is that the frame of the J107 is more adjustable....
Hope that helps a little.