and they should do the same exact thing. In fact, if you go back to the filter and check it later, you might find that it has converted your filter from one form to the other, because they really are equivalent.
I have a habit of using quotes around email addresses, because (long ago) I found that Gmail sometimes didn't keep them together. e.g., filtering with @domain1.com would also match @domain1.org. Quotes seemed to fix that. But Gmail's filters might have improved since then and the quotes might be unnecessary. But they don't hurt.