Chip,
All three are good, but a lot depends on other factors:
1. What type of setup? tank size, c02 fert or no? Slow growth, low maint?
2. High light, low or med? CF, MH, ??
3. Your goals. Do you want a heavily planted tank, or not?
I think with some more info, you will get a more tailored response.
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Is the iron in Flourite important and can it be replaced by iron supplementation in the water column. Do certain plants require iron at the root level vs. water column?
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My understanding is that plants will take nutrients as they can get them, some more from leaves and roots than others.
If you do not plan on additional water column fert, then maybe a nute based substrate would be better for you in the long run.
I use flourite and have been able to grow anything that I have placed in there.
I just started water column fert (EI) but before that nothing, but still had 'decent' growth.
Hope this helps a bit.