You have very clear objectives which helps a lot.
The Explorer should be in stores quite soon, ASM held the announcement off. Is there any way you can take the trip to a store that would have both where you can try them ? Your criterion being so focused should make trying the two side by side very informative.
I know the HS pretty well. As far as replacing your Moog, doing virtual analog patches on the HS, works well. You also can do FM patches on the HS, with the Mutators, but that is obviously the Opsix’s strong suit.
I put together a list of patch libraries for the HS. I still need to add a couple, like there is a new one, at the end of that thread.
With the two new Hydrasynths that all share identical patches expect a ton more. Also the targeted patch randomization built in to the HS makes uncovering new patches by chance far more successful.
Enjoy the adventure as you pursue your new synth.