Sorry mate. I saw the OP, responded and then realised it fell literally after you posted you bought a deck. I own both a deck and vr and I am sure you'll enjoy them both. In fact the deck is an amazing bit of kit. It really is a marvel that managed to cram a PC into something that, in my mind at least, is the same size of a gamegear. But for arguments sake here is my reasoning.
The issue with the deck, is that when all is said and done, once the newness and the marvel has worn off, it's just a way to experience the same games is the same way. The experiential modifier is that you can play them wherever you like. For me, this has been amazing. My daughter was born 4 months ago and I've played more single player games in the last 4 months than I have done in a decade. I can play, pause it, put it down and all whilst being in the same room or vicinity. But it's a bit like when you build a new pc. You spend ages specing it, getting it built, you run some benchmarks and then it's just there running windows and you're browsing reddit again.
VR is the complete opposite to that. It's a whole new way to engage with games in a completely different experiential way. It's a colossal shift in immersion and gaming. I've had a vr headset in some form for the last 7 years and in that time my top gaming moments are all VR related. From the first time I sat in an X-wing and looked over and out the cockpit, braining a zombie in the walking dead, floating around the ISS, playing mini golf. All of those experiences are immersive and engaging and a colossal leap forwards in what gaming can offer. Even with my daughter being born and even with me playing loads of sp games on the deck, I've still played more VR and actively sought out to play vr with mates, way more than the deck.