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Misty, because I personally think she's way better for him ^^ plus, she already had a crush on him o_o and also I think they are cuter ^^ (if only Ash were a little taller o_o; )
actully i think that eventually there will be a completely new series of pokemon with new main chrcters taking the kanto gym leader chllenge that will base ash married to misty and he will own a gym.
...*sigh* There's already a thread about this topic here in the forum. It'd be best if you kept that one alive while it's still going...before it hits the one-month mark. ^_^;