One thing that bothered me about the prequels, and is in the Last Jedi, is that they all use the same recording of the opening theme. TLJ uses the same recording as TFA. I’d change that.
On that same note, other than the Yoda scene, not a fan of them reusing old music. I’d also edit that out, where possible.
Which opening theme version would you suggest?
Not sure, because I’m not sure what you’d be able to get legally (because I don’t think anyone here wants to hire an orchestra just for a fanedit. However if you contacted someone who’s already got a recording, you could get one.
Edit: For example, I used this in my own personal fanedit of TPM. I wouldn’t recommend doing this in a released fanedit, though, because just ripping off their recording and releasing it without credit or permission is legally and morally questionable.