Stock pickups on classic vibes are usually better than the stock pickups on a MIM strat. Other than that, I usually prefer everything else about MIM strats. Their necks just feel better to me. And you can always upgrade the pickups later on. (True, you can also upgrade the neck later on too, but at that point you might as well be buying a new guitar.) In the end, just go with which one grabs you more. And if neither of them grab you, don't buy either of them. There are a bazillion MIM and CV strats floating around, you'll find the right one eventually even if neither of these two is the one.