One possible difference could be in the level of detail. The novel might go more in - depth with character thoughts and emotions. For example, in chapter 71 of the webtoon, a fight scene might be shown more briefly compared to the novel, where it could be described with more elaborate language.
Solo Leveling is definitely a manhwa. Manhwa have their own style and fan base. Solo Leveling stands out among them with its fantasy elements and exciting adventures that have attracted readers worldwide.