I've only used Happy Hoof before, but found it very useful for our old laminitic - she seemed to find it very palatable. I suppose it depends on why you think you are thinking of changing.
ive only ever used happy hoof but all the horses i know love it, my horse day dreams so much when he is eating his feed (tonight being an example where he took 35mins to eat his feed!!!) when he has happy hoof in it....its gone in a flash so im now finishing of his alpha a oil and hes back on the happy hoof!
A friend of a friend very nearly lost her horse from laminitus a few years ago and was recomended happy hoof by the lamitus trust and now swears by it, as you can also feed it as a replacement for hay ( as her horse was on box rest for 12 months)
haha will now shut up as i sound like a sales rep for happy hoof
Mine preferred Safe & Sound to Happy Hoof, thogh I didn't look into them in great depth as neither is a laminitic (touch wood!). I've just started using Mollichaff Hoofkind & they bth seem to really like that & it doesn't look as mollassed as S&S.