The ingredients are the same: peanuts, palm oil, salt.
I cannot taste the difference between the sugar free version and the traditional recipe.
I prefer Jif over Skippy. I think the difference is Jif roasts the peanuts more.
For jelly, I also go with a brand that does not add sugar. Polander All Fruit or something sweetened with natural fruit juices.
Use multigrain bread and Abracadabra! you have a healthy sandwich.