It would depend on the situation. In a playfull, jokiong, or teasing mood i'd prefer closed. In a serious or um... madami adult mood i'de have to say closed.
Well he's hotter with 'em open specially cuz of the color an when they'er open he means business!! But i also like 'em closed, makes him seem madami mysterious an mischievous, leaves you wondering what the hell he's thinking XD