I started out with a ramp/time delay type
Then got a Jordan
(applies the brakes on the trailer just like your applying the brakes on the truck)
Then when I purchased my current ride it had a proportional type controller which was pretty good but it was no Jordan - I ripped it out and installed my Jordan after a couple of tows.
I have not tried the brakesmart so I can't comment on it but looking at how they work I'm sure I would be as happy with it as I am with my Jordan.
With the Jordan I set the brakes on the trailer to just short of lock up when I was doing a panic stop so that even if I slam the brakes to the carpet then the trailer won't lock up and become the navigator for the entire mess. Makes for nice easy stops when beep bopping through town but still has the potential to bring the beast to a whoa on the highway with no change to the controller. That was the biggest problem with the ramp/time delay style, if you had it set so that it would throw you through the front windshield in town then it was like not having brakes on the trailer on the highway and vise versa the other way. With the Jordan if I need more braking effect I just step on the brakes a little harder...