My birds choose peanut butter virtually every time over suet cakes. It's also easier to serve, make into recipes and find at the grocery store. Smear it on tree trunks, buy a hole-type feeder, fill a pine cone or make a feeder by drilling holes into a short branch. Experts say there's no reason to worry that gooey peanut butter will make birds choke or clog nostrils. Just to be safe, mix the peanut butter with cornmeal or grits for a drier food that also provides grit that birds need.
Birds seem to like it straight or blended, creamy or crunchy.
Woodpeckers actively avoid the nutty chunks, but nuthatches most relish the peanut bits.