After listening to the whole album so many times, I think every song got a fair chance, because all of 16 songs are great, it's hard to say which one is better, so I listen to my body
THIS LOVE and CLEAN make my body very comfortable, OUT OF THE WOODS and BAD BLOOD have more positive impact to my body than WELCOME TO NEW YORK and I KNOW PLACES. So former 4 are my top 4 favorites, the latter 2 are not.
Edit: Unfortunately WELCOME TO NEW YORK and I KNOW PLACES were both co-written by Ryan Tedder.
Edit2: I'm more confident comparing Taylor with Adele.
Edit3: What if Taylor moved THIS LOVE to track 5?
Edit4: What if 1989 has one more ballad? Even though I understand she really wants to make a full pop album which is a smart decision, maybe that's why she put the ballads the last, but still...