Prior to flight school my DW was a Quartermaster officer. She did everything from rigger (air dropping supplies), water purification, laundry and bath, to running a supply warehouse for a POW camp. If it involves eating, drinking, shooting, fueling it involves Quartermaster branch.
It’s normally a desirable branch.
I’ve only known a couple AG officers. Both were very good officers and were selected BZ (below zone) to major. As pointed out above, they primarily deal with personnel versus Quartermaster which deals with stuff.
I think some of Quartermaster, Ordinance and Transportation has been rolled up together. Someone with more recent experience can comment on that.