This article contains spoilers for the film and manga, although it mostly focusses on the latter.
Kimi no Na wa. (君の名は。) or Your Name deals with two teenagers: Miyamizu Mitsuha and Tachibana Taki. Mitsuha lives in a small mountainside town in rural Japan known as Itomori, while Taki lives in the busy Tokyo. Although this is more prevelant in Mitsuha, the two of them dream of the other's life. At some point, they begin switching bodies, or as Taki puts it "switching places", sporadically. At first both of them believe their experiences to be some form of lucid dreams, but as the story continues, they are present with clear evidence for this not being the case.
The film and manga were produced simultaneously, which is why I believe it be unfair to "diagnose" Your Name with "better-in-the-original-format syndrome" as Rine Karr of Girls in Scapes[1] attempts to do. Despite this, it obviously just can't be denied that the film is better at conveying its story and the attached emotions than the manga. It is visually stunning. Also, the music really helps bring the emotional melancholy across to the audience.
In my opinion, the manga lacks some of these things. While of course it has no score, animation or voice acting, I still found the manga disappointing in how emotional it made me feel throughout. It's difficult to feel all these emotions it clearly wanted me to feel while it didn't really bother with anything outside of Taki's and Mitsuha's direct vicinity. In the film you get to see much more of the environment, so that it doesn't remain as "pale" as it is in the book(s).
The art in the manga isn't doing it best job at conveying anything really. The only exception to this are the beautiful wide shots of Tokyo, for example I found the few pages after Mitshua's first wake-up in Taki's body particularily well put-together and succeeding at conveying her feelings.
Other than this, there really wasn't much that made me linger over a page longer than I needed to in order to read the dialogue.
Your Name had me wanting for it to make me emotional as most of the critics described it that way, but at least the manga mostly didn't succeed at this. The only scenes that really made me feel much were the ones at the end of the first part, where the readers are presented with a sort of timelapse of when Taki and Mitsuha had just arranged themselves with their predicament and the scene following that, where Taki realizes he won't ever switch bodies again. The sequence of him returning to the collapsed Miyamizu shrine and attempting to interact with Mitsuha's memories left me strangely untouched or at least less touched than in the film.
Shinkai is definitely better as a director and animator than as a writer. I recommend watching the film first and then reading the manga, although of course you've already done both if you're reading this review.
[1]: REVIEW: Your Name., Vol. 1 and Vol. 2 by Rine Karr on the 5th of February 2018 published by Girls In Scapes.