I like angled better, but that's cause I do a LOT of contouring...I use at least 2 blushes, a bronzer (in the hollows) & a MSF every day.
I like having the control & precision of the angle brush.
I use rounded blush brushes for fuller faces (when I put the blush mostly on the apples of the cheeks) or really, more for foundation application than anything.
But I really <3 small brushes w/ concentrated hairs (like MACs 109) for cream blushes & such.