Tandem Reads

So the first time I read Empire of Storms and Tower of Dawn was as the books were coming out and I read them as two separate books. This go around I shall be tandem reading them according to this timeline I found. One because I've never done a tandem read like this before. Two because I think it will be interesting to read it as one giant book.

Should I do a review of each book individually, tandem only, or both?