Of course. You have preference. But Zoro and Sanji are very different in my opinion.
In fact, Zoro represents Eastern Masculinity while Sanji represents Western Masculinity. Hence Zoro is the serious type with very little expression of affection or chivalry while Sanji is more expressive.
As for Luffy and Zoro, since I am a fan of both, I can find dozens of similarities between the two. But the important ones is that they don't seem to have any girl attached to them and they don't have anything to look forward to at EoS.