@ddljohn-- Propolis is a type of resin that bees collect and use in the beehive. Some manufacturers add this to their bee pollen and royal jelly supplements to make the supplement more beneficial. These are usually combined in a base of honey to preserve their benefits.
I personally take an organic royal jelly and bee pollen supplement without propolis. I'm sure propolis is beneficial too, but I'm satisfied with my current supplement. It gives me a lot of energy and my immunity has improved as well. I have chronic allergies when I don't take bee pollen and royal jelly.
It's up to you to decide what type of supplement you will use. I think that most beehive products contain much of the same minerals, vitamins and antioxidants. Even though bee pollen and royal jelly are different things, I'm sure you will experience benefits regardless of which one you use. Just make sure that the manufacturer is well known and trustworthy.