Heard different different things from different people,, can't really decide well about it....I really need some specific reasons to why the drama/webtoon rather than webtoon/drama? 

MDL - MAL

Actually, I've started watching drama, but didn't like the series at all. Can say nothing about webtoon

I started the drama but dropped it at ep 2 idk why I just didn't got hooked by the ML at all but the FL is pretty sweet

Webtoon.
I was not a fan of the drama. But I have to say I read the webtoon before watching the drama so that may have impacted my expectations and thus my disappointment.