I use MSU for rain water and a beer-based recipe, I also add 6 drops of either SuperThrive or KLN (alternating each feeding) in each gallon of water I use.
One thing I have been told...and believe is true...orchids do NOT need Bloom Booster if they are getting the correct nourishment.
As far as "the best"...there is no one "best" that will work for everybody! We all have different collections, being grown in different conditions...there can be no one correct answer. You have to be willing to experiment sometimes...maybe you'll find something that works better than what you've used in the past...and maybe not
