I have found Surfactants are cheap and always have improved the performance of Glyophospate. Doesn't matter who makes the stuff.

 Many times it is not the strength of the chemical it is the ability to get it into the plant.  Any chemical sitting on a plant means nothing. The chemical has to get into the plant.

Ever have this stuff ?  Joint grass, most evil weed some say impossible to kill. I get excellent results with 1.5-2 oz 24d per gallon but,, I also use 1qt of surfactant per 20/gal water.