I feed Purina Strategy to my horses that are working hard and I like to see more weight on, and Purina Strategy Healthy Edge to those that are just doodling around the pasture. I run my boys on a nice, healthy pasture, so grain isn't really needed unless their working.
I didn't see as much weight gain on Healthy Edge as I did regular. For example, Divo had a crestier neck and bigger build on Strategy, but maintained a good weight but nothing excess on Healthy Edge.
Never tried the other one you mentioned :)
Wait! I'll fix it....