All the way for Elaine! Let's look at it this way: While Elaine did sucker punch Guybrush, Morgan hacked off his hand clean off, which in turn worried Elaine (and of course question the whereabouts of his wedding ring).
Even after punching him in the jaw, making him hang over a pit holding a heavy treasure chest to his supposed demise, and sending him off to do silly errands, Elaine loves Guybrush where as Morgan (and don't get me wrong, I think she is a very cool new character) pretty much dropped all enthusiasm when she sees Guybrush negotiating as oppose to hacking and slashing the pirates in Chap. 3. I did feel bad for Morgan when she was hitting on Guybrush and he just brushed her off like it was nothing....but I think that just proves his loyalty to Elaine, and also Elaine got pretty P.Oed at Lechuck when he took his time and she wanted to go quickly to Guybrush. And this is just a fan's perspective, but I think Elaine purposely didn't go with Guybrush because she fears that because she has the pox (her not being aware Guybrush has it as well) she would harm the one person she cares about most.
....But yeah, I'm all for Elaine.