A Toriel-GLaDOS sounds more fun to me, she promises you a pie instead of a cake (and then she actually gives you the pie) then she doesn't let you finish the test chambers because "they are too dangerous" so she always solve everything for you, then Flowey-Wheatley tries to convince you that is all an act, that she will kill you eventually, and you must stop her and put him in charge, of course is all a trap, you "kill" Toriel and Flowey becomes a "God".