Whereas sometimes we use them, sometimes we prefer other products<br/><hr/>Whereas sometimes we use them, other times we prefer other products<br/><br/>While sometimes we use them, sometimes we prefer other products<br/><br/><span style="background-color:#ffff00;">While sometimes we use them, (at?) other times we prefer other products</span><br/><br/>Please, which is (are?) correct?<br/>The yellow one "sounds" better to me<br/><br/>Thanks