I use Flourish mainly, I'll also use TMG, Tropica master grow. Sera is decent also. I used the old Kent products, I did not like them. The newer Kent Seachem clones seem good, but still lacking it seems, I've not done a critcal test of them though, testing traces is the hardest thing since the impacts are so small, they are traces after all.
F trace adds everything but Fe.Plants use more than just those, they also use FE, so I use a braod Trace like Flourish, some feel adding an extra spike of Fe helps, I'm not sure, I have not seen that, but then again, I add more traces than anyone suggested for many years.
You can add it dry (cms) if you want, I'll typically add traces in liquid forms..