Which root stim should I get next?

So I've been a long time coco grower and just setup a RDWC setup. I'm nearly out of Rhizotonic and have heard great things about Roots Excel. I don't really want to buy both since they cost so dang much.

What would you guys do? Buy more Rhizo or Roots Excel... btw I do use H2O2, but I swear I've read it still does wonders when running H2O2.

I've heard that Cutting Edge Solutions G-Rex is some really fantastic stuff.
I use Rhizo myself, no reason to fix something that isn't broken.
Lots of people use Humboldt Roots and Super Thrive and they seem to work well also.

All of that stuff is at least worth trying I think.

i use CloneX. yes they're expensive, but a single bottle should last you a LONG time.