I would say they are comparable, Hugh quality feeds. I feed the Tribute Kalm N EZ to my 18 year old and 11 year old broodmare. They look fantastic. Glad I made the switch to Tribute.
I just started feeding Tribute we have no dealers but I can buy through Amazon. It cost me a little more than what we have here but not much. I have to say the two I have on it are shiny and holding a good weight, they look really good. I have never fed Bluebonnet but will be sticking with tribute.
I cant compare to tribute 9 never used it) but I do feed bb ex factor its a low starch low sugar and all 3 of my boys look awesome I have 1 hard keeper 1 easy keeper and a yearling the yearling does get the growth and development with it by bb I love the feed - I tried something else for about 10 days and could see I was loosing muscle so I went right back to the bb and within just a few days I could see them coming back- I wont switch again ---dapples and muscle!