It looks like the image on the left has more colors or the image on the right is blurred. Also one screen is bigger then the other, a bit. I can't say for the brightness because I am sure their is a way, because brighter does not mean better. I do not know what p is but I told you all of that just by looking at it minimized.
You have to understand with Television sets back then, the minimum for videogames was 15 inches which is still used in production today. Also most people like myself have a 21" type screen, Hardware from the 1990's and back was all Analoge based, meaning the better your hardware, the better your outcome.
The best for the PCE is the Muze vision but that requires a whole bunch of things to setup.
Otherwise once again, Hardware depends on every little physical compenent that delivers the information.