@Edinburgh is the only person I've seen who says HF is hotter than OF. Everyone says the opposite. (FWIW.).
I don't have any plans to use Fox Farms anything. I have
a light airy soil (<<link) that works fine (56% Pro-Mix HP, 22% Kellogg Patio Plus, 22% perlite. The HP already has 35% perlite. And, Patio Plus has 5%, maybe) with
my nutrients (<<link, after I dialed in the strength). I like having more control over the nutrients delivered (without going all the way to soilless or hydro), feeding sooner. I also like faster wet/dry cycles.
I started growing in soilless (HP plus 25% more perlite) using GH Flora 3-part hydro nutrients. I wanted to go to soil, but not really the full soil experience (heavy, rich). The above is my halfway point. It feels like I'm doing the same thing I did in soiless. But, there is some soil involved; I'm using more soil'ish nutrients.
I have a goal to eliminate Pro-Mix HP from my soil. (It's not an urgent need. It works fine the way it is.). But, I like to be able to use & recommend things that are easily available, from the local hardware store, without getting into specialty stores. (Not that there's anything wrong with such stores. I just don't think cannabis needs a lot of that stuff. I've been trying to be a minimalist that way.).