I prefer the H&S tuning on my truck. The smarty just didn't seem to be capable of smooth power on my truck.
All the reading that I have done says that each truck is unique and some prefer smarty and some prefer H&S.
I picked it up to try it, ran it for 2 days, then took it back off.
ETA - I put the valve back on since smarty loses its a$$ on the bottom end if you don't. I prefer not having unnecessary stuff zip tied under the hood if I don't need to.
I have a long block that needs a couple pistons, a couple of heads, and a couple turbo's.
If interested you can make a couple more posts and you can get and send pm's.