Pro Tip: No matter what you do, someone will complain that you did it that way.
That said, do what you think makes the most sense. If the prologue contains information that is very important to the flow and part of the story that you can't think of any other way to get it in there, go ahead and write it. If you think you can weave the important parts into the story, but also want to add more just for flavor, maybe you put it in as an option. Or if you can find a way to include all the important parts into the main body of the story, maybe you just leave it out entirely and weave more into the story itself. All three ways can work, all three can be effective and good, and all three will be liked by some and hated by others.
My personal opinion matches that of the advice above: if it's just extra window dressing, why it is included at all? For example, is it to explain how magic works in your world? If magic works and everyone in the story understands it, I, as a reader, probably don't need that specific information. Is it background information that's about the planet you're on that doesn't add anything to the story? Well then why do I want to read that information at all?
For me, what I try and do as a writer, is to have a short statement, hopefully just one sentence, but sometimes two, that describes the entire story. Then, when I'm writing, I can refer to the statement. If what I'm writing doesn't have anything to do with the statement, I need to stop writing that!
For example, here's one: "An archaeology student races against time to decipher the secret of the pyramid before his rival uses the secret to control the world."
That's the whole story. So if I'm starting to write about the formations of the pyramids, and that has nothing to do with deciphering the secrets, I need to stop writing that and write something else!
I'm not sure that's much more than a bunch of rambling, but I do hope that helps you in some way.
