My standard phrase is "More bang for your buck".
There may be exceptions/deals to be had. But a given capability is more expensive to get in (or put into) a laptop case, compared to a desktop/floor-standing 'beige box'[1]. And you just know you can more easily replace your GPU, processor, expad your RAM[6] or even redo your entire mobo+rest in six months' time, in the latter, should the opportunity arise. If you need a (new? adittional?[2]) optical drive then it's (much more) trivial. Should USB4/etc ports come about, there'll be a rear-plane or front-slot option far more likely (or just add more USB<=3 slots rather than being forced to daisy-chain additional hubs.
Secondarily to that, less fuss if the screen goes dead[3], wifi/bluetooth burns out, you spill mead[5] on your keyboard, or the HDD needs replacing[6].
And someone who breaks in and cadually rifles through your dearest posessions is unlikely to wander down the street soon after with your mini-tower under their arm.
Advantages to the laptop are if you
aren't sticking to one clear working position (or possibly if your personally chosen workstation is vextraordinarily tight, or the armchair in front of the TV?) and needed portability. Because you also wouldn't want to be carrying a mini-tower, or even a SFF box, around too much. And laptops may have inbuilt webcam(s), fingerprint scanner, memory-card slots, etc, that you'd have to add on and install yourself (card slots a possible exception), but will be part of the price for at least some laptops.
But you know your circumstances, plus what's on sale, so there is room for a laptop to be better for you. I just rail a bit against those who think laptop==better. (When the Covid thing forced the need to help with remote-learning, for schools, I was annoyed that there was so much "laptops for the disadvantaged". Especially as it probably was also a Child Safeguarding issue, whereas a stationary computer placed firmly in the family-space could be less likely to be a predator-fest via the closed bedroom door.)
Hope that helps, though.
[1] Though black seems to be the current vogue, and no sign of it changing, transparent sides and glowy elements notwithstanding.
[2] Also out of vogue, it seems, and treated as dust-traps as much as floppy-slots once were.
[3] Technically also an upgrade-benefit, unless you get the other input peripherals and start to use your laptop closed as a microthin 'box', as if a non-laptop.
[5] Or any drink, but humour me on this.
[6] HDD (or RAM) might be easily swapped in some laptops, but you still are constrained to the more expensive thin-form drives, and some laptop manufacturers of time past (Dell, Toshiba, IIRC) got a bit proprietary with their not-quite-IDE-like connectors for
their HDDs, that were otherwise the same form-factor as other laptop HDDs - maybe all strict SATA these days, but I imagine there's still some instances.