I started out with one of those Wacom tablets but couldn't get the hand-eye coordination right, so I decided I needed to draw directly on a screen. I bought a Microsoft Surface Pro 8 and absolutely loved it but found it to be a bit cramped - not to mention the fact that t didn't quite have enough horsepower. With several layers Krita would bog down and eventually crash.
Last year I bought myself a Dell Inspiron 7630 2-in one laptop. It has a 16" 16:10 OLED screen with 3840X2880 native resolution. The pixel density is right up there with Apple's Retina display (it's actually higher in some cases) and the OLED makes colours really pop. It came with a rechargeable stylus that seems to be very precise - where I touch the screen with it is where it draws, anyway. With an Intel i7 i360p processor and 32GB RAM it has more than enough horsepower to run Krita, and I've never seen it even hiccup when working on a 6000X4000 pixel image with twenty or more layers. Because it's a real laptop with a real keyboard I can write on it, and when I want to draw I just fold the screen backward and it converts into a tablet.