I have zero experience with either of those. But depending on what you're going for, you could make that decision.
Is this the final size you aim them to have? Can they get bigger? Have you fertilized them enough so there are building blocks to build with?
More backbuds is fun, but if you're going for a larger bonsai, it would be wiser to grow them out.
I think everyone will respond in a fashion like I did. It's not that I don't want to help, but it's hard to look inside someone elses head and see future intentions.
Do what you think is needed, at the ideal time for the species. It helps a lot to be 100% sure about what you have.