You give the comparison just above,
Neville, no?
CGA _mostly_ is good in higher modes, but sometimes gives off-colors, and composite modes not always works in real hardware.
EGA is mostly compatible with VGA/SVGA, but can give flickers in rare cases.
Tandy is incompatible with all this modes at all.
(It's from my experience working with VGA then SVGA displays, 20+ years ago. DOSBox more tricky with that, so while I can give more incompatibility examples, I am not totally sure they are the same for the real hardware).