Hands down, Photosynthesis Plus.... That stuff is nuts. Matter of fact, shit can get out of control on your ass real quick using it regularly if your plants are nice and healthy. And I'm a less is more kinda guy... Nutes / Silica / Orca+hydroguard (root zone safety) / calmag / Rapid start / Photo + And that's it...
Smells god awful, like a porta potty at a Pantera Concert. Just fucking rank.... especially a new bottle of it, but as you use it the smell gets less vomit inducing. I put up with the smell because the stuff is just insane. It has photosynthetic bacteria and host of other microbes and The photosythetic bacteria get up into the cells of the leaves and can take in spectrums of light the plant can't and convert that into stuff the plant can use. Plus a bunch of other scientific shit that's way above my head, lol... I just see the results and it's no joke.
Here's a good youtube explaining what's going on.