partially agree, with the caveat that the industry/markets they originate from and the conditions and demands that shape them are the reason for the perceived quality difference. speaking in broad terms, there's the age of the industries, the way that manhwa/webtoons (at least that i'm aware of) are primarily published digitally, whereas manga has primarily physical publications, release schedules + the full-color default with manhwa/webtoons, the cultural differences shaping domestic audiences and their preferences (and who publishers cater to), self-publishing capabilities and so on. broadly speaking again, in the japanese industry, there are more niches that can foster and nurture different types of stories and support artist development compared to the korean scene.
you should also keep in mind the language divide. it's generally easier to come across a variety of manga in english even without official translations because of fan translations and the popularity of japanese media. there are probably more complex and well-done manhwa that english speakers aren't aware of because of the language barrier and the hurdles to translation.
I prefer Mangas than Manhwas. The character depth story writing art style is soo much more better than manhwa even if they are colored and even the best ones like KS, low tide etc they don't have dept like Mangas do artists like Harada, caste heaven etc etc am not able too remember but if you get what i am trying too say.
And i need more stories like those but i guess people are not picking up those niche because of lenzin and its popularity, and real gems are missing out. I need more dept and psychological details with that 100/100 smut scene.
Tell me you opinions is it just me ??