I don’t have any of the recent amps, but will throw in some thoughts on one of the ones you’re discussing.
I’m with Les on all things HXDA. Mine are both 50 watters, and I can’t imagine not having one available now. In my opinion, they’re the most accurate to the old Plexi tones out there. No doubt, the HXDA is its own thing, is a sound that I searched for a long time, and is securely ensconced in my music room.
Listening to the demos on the newer amps, both HX and HDRX, the tones sound varied enough that I’d like to try them side by side with the HXDA, just to see what the differences and similarities might be. They could certainly earn an add!
HXDA for sure, though. BTW, both of mine were originally heads, but I bought a combo cab and made one a 1x12 combo (sold the head cab to recoup my funds). The other is a paisley head that’ll remain stock. You might do the same if you want to go head/cab.