The G533 is a bit more comfy and has a wider soundstage. But it’s also a bit wider and harder to carry around in a bag.

Outside of that I don’t think you can go wrong with either one. If you plan to mostly play/listen around your home I’d go with the G533. If you’re ever going to take the headset with you, the HS70 is easier to fit in a bag and a little bit more robust-feeling.