SPOILER ALERT!

Ok jut finished both endings on normal.

If you save Mia - on the ship when Mia gets Ethan out of the black crap Mia will sacrafice herself and will push you out of the door directly opposite.

If you save Zoe - you will fight Mia when she saves Ethan from the black crap (10-15 seconds) and you will have to run out of the door to the right.

Has anyone done any timings on this as it changes the route slightly and wasnt sure which is the faster route to do.

Mia's lifeboat section is faster and not doing the fight saves time.

Definitely saving Mia, that is much faster because you skip the scene with Zoe and you also skip the fight, too.

Awesome thanks for the clarification