Yes, generally it does. The manga of Haruhi is based on the light novel and tries to follow the main plotlines and characterizations presented in the novels. However, as with any adaptation, there are some minor differences here and there to fit the manga format better.
In the manga, Tamaki and Haruhi indeed get married. Their relationship progresses and culminates in this beautiful event. The build-up to their marriage is filled with sweet moments and challenges that they overcome together.
It depends on personal preference. Some people might like the light novel for its detailed descriptions and deeper exploration of characters' thoughts. Others might prefer the manga for its visual presentation and easier digestion of the story.
The Haruhi manga and light novel have different visual and reading experiences. The light novel is mainly text - based, allowing readers to use their imagination more freely. For example, when it comes to character descriptions, you can create your own mental images. The manga, on the other hand, presents the story visually. It has detailed illustrations that directly show the appearance of the characters and the scenes. So, the manga may be more appealing to those who like to see the story unfold in pictures right away.
Another aspect is the level of detail in character design. In the light novel, the author can use a lot of words to describe a character's appearance, personality, and backstory. In the manga, the artist's interpretation of the character is more direct. However, the manga artist may add some unique visual elements to the character that are not described in the light novel, which can give a different feel to the character.