I like to think of things in different levels. If you adhere to the original movie being it, that really doesn’t fit in with the idea of canon so here is how I look at it.
OT - Platinum Canon
OT & PT - Gold Canon
OT, PT, & ST - Silver Canon
This makes sense in theory but not as much in practice. The PT is well…the PT and the ST isn’t even close to being over. Pretty premature ranking in my opinion.