Haven't tried either of the those orvis lines for bass fishing but I bet the difference is in the coating and possibly the core. I think a mono core stays stiffer than the braided ones. Many of the freshwater lines get very limp and sag between the guides and just don't shoot well in warm humid weather. Ever tried double hauling a cortland 444 peach line on a ww pond? it just doesn't do well. Cool mtn stream it works fine.
Several of my serious warm water fishing friends have gone to salt water tropical lines on their bass rods. The line stays more stiff and shoots well. I use Rio Clouser fresh water lines but have been wanting to get a tropical clouser line to try out.