I think Big Bloom primarily uses worm castings, seabird & bat guano, and kelp...while Tiger Bloom uses all three of those, along with other sources of bloom fertilizer and trace elements.

I like Tiger Bloom, but don't use it all that often. I primarily use guano's and make teas throughout flowering, but might add Tiger Bloom once every 3-4 weeks. If you use one exclusively, you'll have to let people know how it worked out.