It would depend on the situation. In a playfull, jokiong, of teasing mood i'd prefer closed. In a serious of um... meer 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 meer mysterious an mischievous, leaves u wondering what the hell he's thinking XD