For me personally, HHC is a little less strong than regular Δ9, but I get none of the anxiety with it. THC-A just turns into regular Δ9 when heated. The phorols (THCP and HHCP) are the incredibly strong ones, and I’ve had 2mg of HHCP make me high for a solid 24 hours before.
I’d highly recommend checking out Turkey’s site and info sheets for all things alt noids