I stumbled on this post by Ed Levine at Serious Eats. I totally agree with his observations:
The peanut butter and jelly sandwich easily deserves a place in the Perfect Food Pantheon . . .It's a great article. You've got to appreciate anyone who will invent a noun called "goopiness." (There's really no better word.)
Rye and pumpernickel are not good delivery vehicles for PBJ. We stuck to Pepperidge Farm for our taste test, although some people might argue that it's too strong to stand up to the heaviness of peanut butter and the goopiness of the jam.
Speaking of goopy jam, I prefer raspberry (seedless, if I can find it). Grape jam is just a little too pedestrian, and its fruit flavor takes a back seat to the sugary taste. But I frown on getting too experimental in the area of jams for PBJ.
I love orange marmalade on toast or biscuits, but for PBJ? No way. That's a sacrilege.