Better deal in what exactly?
For the exact same games that got released on PC that are PS5 games, I bought on PS5 far cheaper then Steam has ever had for GOW, Horizon, FF7 remake, ratchet ( coming to PC soon but at full price ) etc..., all of which look amazing and performs amazing on PS5, FF7 remake on PC does not look any different to PS5 performance mode and thats damning to hell, Ive seen PSN deals beating Steam prices more often then ever before and new game prices are roughly the same, also games that are released on PS5 go down faster then on Steam esp the physical editions, the adage that PC gamers say just wait til its on a steam sale usually takes closer to a year to happen.
On consoles, they go down within a few months of release.
Also, as someone who owns rather expensive peripherals on PC, you wouldn't be using your office based Dell mouse when gaming, you either buy a controller or a more fitting mouse and keyboard to fit the bill and typically the average price on those is £30 each, so add £60 to that.
If you are using a controller and wish to go wireless, if you intend to use the official Xbox controller, well pucker up for the wireless receiver that you better get for it which is an extra £20 if you want the wireless experience with it.
I ask you, please tell me what makes a £650 PC without any nice keyboard and mouse or controller a better deal.