The web novel often has more raw and unedited content. The light novel, on the other hand, may have some refinement in terms of language and presentation. For example, the light novel might have better - organized paragraphs and more polished dialogue to appeal to a wider range of readers.
Well, in the Overlord web novel, the author might be more experimental with the plot and character development as it's a more direct-to - audience medium. In the light novel, it may follow more of the traditional publishing norms. So, the pacing could be different. The web novel could potentially have a faster - paced plot progression, while the light novel might slow down in parts to build more atmosphere or character depth.
One significant difference lies in the art. Light novels usually come with illustrations that enhance the reading experience and give a visual representation of the characters and the world. Web novels generally don't have this feature. Also, the web novel might be updated more frequently, allowing for a more continuous flow of the story, but it could also mean that there are more plot holes or inconsistencies that get fixed later, whereas the light novel has been through more editorial review and is likely to be more coherent in that regard.