For a gamer, surely the answer to this question is just as much a question of someone's relative economic status, but anyway...
Given past history, I'm almost certainly buying both within launch window - with Series X being a day one pre-order. My decision to buy a PS5 right off the bat will be based on previews of how well they've addressed cooling and their success or otherwise with backwards and forwards compatibility. I thought Sony were really sloppy with the PS4 Pro hardware this gen, and while I DO expect they will deliver a better cooling system this time around, I'm less confident in their approach to backwards and forward compatibility. I have a handful of unfinished PlayStation games that I'm waiting to play on better hardware. So after the current generation, Sony have a harder sell to get me onboard with a day one / pre-order.
Regarding the snark about people making up their minds prior to release - well, I'm certainly confident enough with Series X that my existing Xbox library will "just work" with quality of life improvements to loading times, back compatibility enhancements, etc, that I'll be seeing benefits to swapping out the One X right away even IF there isn't a single new game I wanted to play at launch. After last-gen, I also trust Microsoft to produce quality hardware. Finally, since most of my IRL friends play on Xbox, that's where the majority of my daily gaming will take place regardless.
So I've got absolutely nothing to lose by a day one Series X purchase.
With regards to pricing, (someone's personal income situation aside - if you're struggling to pay rent, I get why you're not buying new consoles) I look at the cost of the console in terms of entertainment hours provided. I'm spending a handful of hours gaming and chatting to my mates just about every single day. If these new consoles cost TWICE as much at launch as they did last gen, it'd STILL be a no-brainer for me to purchase. Further, unless my circumstances change, I'll also certainly re-purchase both when, inevitably, both companies release a special edition in a white case - just because it looks better in in the entertainment unit that I'm staring at.
I spend more than the cost of a console on streaming services I barely consume. I spend more than the annual purchase price of a console every year buying take-away coffee and that's not nearly as satisfying... So when I reflect on the stupid stuff I spend money on, I'm more than happy to spend money on a new release of a games console given the enjoyment I get from it.