1991, Arcade, The Simpsons. Because I miss that experience so much!
Really though, I'd pick the PS2 and God of War. It's easy enough on the controls, the theatrics and scale are still super impressive, and everyone feels awesome chopping up hoards of stuff.
VR headset with Half Life Alyx, I assume they'd have seen movies like the original Tron so they'd already have some conception of virtual reality but seeing them interact with VR integrated and as a fully fledged gaming product would make for some interested reactions at least.