The Rig 500 Pro is in a different price class so I don’t feel that’s a fair comparison.
Otherwise, it kind of depends on what you personally want. Your potential selections are all “good,” so it’s going to come down to what your personal tastes are.
The RIG series offers a modular design that would theoretically allow you to snap on different headbands, but they give up some build quality as a result thanks to an all-plastic design. And you may not ever decide to really do that.
The HS50 has a much stronger metal frame and a more robust feel overall. It also offers a little more bass response and more isolation thanks to its leatherette pads, but those will warm up your ears more.
I’d rank their sound qualities and mic qualities as being in the same ballpark, so it’s really down to your personal tastes. Do you like the modular design of the RIG? Are you willing to deal with less isolation from the cloth ear cups? Would you rather have the stronger isolation from the HS50? I can’t really answer those questions for you, since I’m not inside your head. :)
I saw your other comment also but it came in over the weekend and I’ve been trying to take weekends off. Apologies for not getting you an answer sooner.