Jif
Pros: Jif is very smooth, fluffy, and airy, which allows it to spread easily when making sandwiches.
Cons: "Choosy moms choose Jif" or "Choice of choosy moms." Sorry, but what's sexy about those slogans?
Skippy
Pros: Thick consistency. A little more dense than Jif (could be a con, depending upon your preference). Better, stronger, more nutty flavor than Jif. "Fuel the Fun" slogan is way better than anything about choosy moms.
Cons: It plays in your mouth a little longer than Jif. Saltier than Jif.
Verdict: While they are nearly identical physically, by taste, and in nutrition facts, one number stood out. The expiration date. OIbn the jars that we bought from a not to be named south of Flagler street grocery store, Skippy expired in 2011, while Jif was good until 2012; this would seem to mean it has more preservatives. Skippy is the winner based on the fact that is has a cooler slogan and won't outlive Twinkies.