Normally the comparative of well is better so the answer that it should be "better informed" sounds, at first, like the correct answer and "more well-informed" would be ungrammatical making the first professor a dolt.
But it is not so. "Well" is not used in its normal adverbial sense here, but it forms a complex adjective ("well-informed") whose comparative and superlatives do not follow the normal rule. A person can be "well-informed" as a state of being and can thus be "more well-informed" if that state is either increased or intensified.
Think of it this way and you will probably understand immediately: Order a steak "well-done." What if it comes back rare? Are you going to send it back saying, "I would like that better-done?" Probably not. Instead, you will say, and correctly so, that you want it "more well-done."
Sorry, but that's the case here, too.
· 1 decade ago