That’s a tough one since one is wired and one is wireless and I don’t know if that matters to you.
My gut instinct is to recommend the RIG 800, since more folks want wireless these days.
The A40 (Assuming you’re just getting the headset and not the full bundle) has a better mic so if that’s important to you it’s the better choice. And its cable makes it easier to hook up to other devices. The sound quality is a bit more fun by default…but the RIG 800’s EQ modes make them more or less even.
They’re both solid picks, you should select the one that has the features that suit you best.
Thanks for reading and for the question!