Herf,
Be prepared to get twice as many different answers to this question as the members responding!

And then do not forget the "secret ingredient" we all have to hedge our bets.
As I jokingly tell people who ask me, "Do you want this year's secret blend or last year's"! I have found that 1) Whatever you do, USE SOMETHING; 2) Use it for a full year before you evaluate it or recommend it and 3) Experiment with only a few plants if you are considering changing to a new formula. The bottom line is: Will this work for me under my conditions?
CL