I voted neither.
I like Morgan; she participated in the best scene of the episodes yet, and I will love to see her again in future episodes. As of now, she is pretty much a stereotype, but that is played out really nicely. Her character might gain new aspects, making her more rounded, and, of course, she may undergo character changes (one at least, as we all hope). Nonetheless, this is not enough to have her star in her own game, even if I did not think that female characters are not one of TTG's strong points.
Recently, I've played the (German) adventure "Book of Unwritten Tales". There's one character named "das Vieh" (meaning "the critter" or "the creature"). It is a pink-furred something with big eyes and a mouth bigger than Guybrush's pockets. It communicates through incredibly funny gestures and a language none of the other characters understand. There was one scene, about 15 minutes in the game, where you could control it, and that was definitly the most wonderful part in this really good game. Now, the developers have announced that their next game will center entirely on that character - and I definitly won't buy it. Some characters are best in small doses.
Morgan LeFlay is probably one of these characters.