At this point, going movie-only, I’m a fan of this order for a full marathon:
- TPM
- AOTC
- ROTS
- Rogue One
- ANH
- ESB
- ROTJ
- Solo
- TFA
- TLJ
- TROS
For a first time viewer, though, I’d always advocate for going release order and leaving the spinoff movies for after the saga.