BTS' English songs are fun...but they sound a lot like Western pop. So do some of their recent songs but not all.
Their (older) Korean songs are usually more musically complex and there's a lot more deeper lyrics, which is what makes KPOP unique. I like both, but their English songs are being overplayed and their Korean songs aren't as much (probably because they are in English and people are not big fans of reading lyrics and watching an MV at the same time).
Overall, it's based on opinions. I like more of their Korean songs, but their most recent English comeback "Permission to Dance" is probably my favorite out of their Eng songs.
I like their korean songs better