Both PT and ST would be great for
3-in-1 edits. Each relying on a central film.
PT could use ROTS with maybe half an hour of TPM and AOTC to open with
ST could use TFA and TLJ and TROS to wrap it up. Stealing ideas for Adobewan, you could use the death of Snoke as a semi convincing end to the Saga, especially if it quickly proceeds Starkiller Base blowing up.