ok here it goes
#1 i think the shoulder straps would get in the way when you shoulder your gun, plus i dont like the white lining on the inside.
#2 it is nice that is has a padded back like the others, this could be a viable option not really any cons
#3 nice thick padded straps and seat but NO sternum strap to keep it from sliding off your shoulders
#4 alot of pockets but not call specific pockets. like the gun strap
#5 i like the clean and organized look of this one. not as many pockets but looks more comfortable.
#6 3d leaf looks great but i have a feeling you may have trouble getting into your call pockets with all that in the way.

to be honest i would sugget trying at least your top 2 picks on before buying to make sure.
If it was up to me either #2 or #5.
#2 for short days but could also be comfortable for long afternoons.
#5 for all day hunts.