It would depend on the situation. In a playfull, jokiong, または teasing mood i'd prefer closed. In a serious または um... もっと見る 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 もっと見る mysterious an mischievous, leaves あなた wondering what the hell he's thinking XD