No, they're not the same. Manga comes from Japan and has its own unique style and storytelling techniques. Manhwa is from Korea and has distinct characteristics too.
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.
It's hard to say which is better. Manhwa might stand out in certain aspects like modern themes and bold visuals, but manga has a deep-rooted cultural influence and a vast library of classics. It really comes down to individual tastes and what you're looking for in a comic.
It's hard to say which is better. Manga typically offers more classic and well-established franchises. However, manhwa has been gaining popularity for its fresh takes and innovative concepts. It really comes down to what kind of stories and art styles you prefer.