I like the way you can create any screenmode you like using P96 or CGX.
Say for example you want to play a SNES emulator, you can go into P96mode and create a 256x224 screenmode, run the SNES emulator, and select the newly-made screenmode in the requester box. Now you can play full-screen SNES games just like on a real SNES.
On PC / Windows you can't create your own screenmodes, just choose from standard Vesa modes. So for a 256x224 SNES display you'd have to play in 320x200 with borders left and right and with part of the top/bottom chopped off, or in 512 x 384 with big borders left / right / top / bottom, or in a higher res mode with the pixels 'stretched to fit' which never looks right.
If for some reason you want a 946 x 573 Workbench screen, you can do it, but if you want a 946 x 573 Windows screen, you're stuck.
