The eyes on the Mogwai are honestly very tedious & annoying ; the "Articulated Eyes" gimmick doesn't quite work all too well, it's a royal pain in the ass to try & get them into a position that doesn't look retarded - Keeping them like that is another matter entirely!
The Gremlins however have painted eyes which don't move, this is probably for the better actually as they don't suffer the issues the Mogwai do and they end up looking SO much more life like - George's eyes look absolutely amazing in my opinion.