When our daughter was young. I took into consideration what could she understand and handle part of this conundrum is when you have a child that is more mature and a bit accelerated in their reading, sometimes they can handle more advanced subject matters.
For instance when she was 8, we saw "Ever After" it was rated PG13. for I think violence, She loved it. She always loves a movie where the Heroine is strong and saves the day..
At 11, we went to see "Oh Brother where art thou?" again rated PG13.. for
Violence
She realized pretty soon, it was based on "the Odyssey." They had studied Greek Mythology in 5th grade and performed some of the scenes form the Odyssey in the Greek Play.. and she figured it out. She was thrilled to see it performed, in a different era..
And so as parents of our own children.. we know what they can handle. And what will cause them concern.
Now my husband and I went to see a movie rated R, (started at 8pm) I do not recall which one probably one of those alien vs humans.. and it was so gory and violent, we were flinching.
A couple were there with their 2 boys.. They did not look older than 8.. They sat in front of us, I raised my eyebrows to my husband.. They watched the entire movie.. Heads being blown up, cursing, hacking.. awful.. But when the (actors )man and woman started kissing and about to make out. he grabbed up those boys and dashed them out of the theater!!! My husband and I laughed at loud. The wife sat there through that whole scene, then texted the dad, and he and the boys came back to finish out the movie, Amazing..
These are your children and you know them best. The best way to decide is to see the movie yourself and then decide. Each child has their own reactions.. Only you know what they will be.