The rest dont matter unless you hate yourself and want a chair that drives like a hovercraft as you cant program them... If you care!
Do you have bad eyes? I think that for outdoor use brightness is at least as important. You cant see the permobil PCJSM one outdoors in comparison to the CJSM2 for e.g. So even if it was bigger it would be useless.
QLOGIC 3 looks to be 2.8 inch? Cant measure as dont have one. But it is also about the size and design of the graphics too. This looks hard to see, not particularly clear/big graphics either.