I've just realised that if I get either console (I'm getting an Xbox, hence why I'm posting it here), not only do I need a new sound system (because the new consoles have no optical ports on them), I need new speakers too (because my 10+ year old sound system has the speakers hard-wired into the back of the subwoofer, which is hard-wired into a control unit).
The TV has an optical out, but doesn't have Dolby pass-through. So the best I could do is stereo sound, and not get any use out of my 5.1 kit.
Cheapest Dolby Atmos speaker set is £799, cheapest AV receiver that can cope with Dolby Atmos, Dolby Vision and everything else is about the same.
£2,000 - for a games console. That's without even updating the telly to a 120hz one.
Maybe the PS4 Pro isn't that loud after all...