both are shit.

both company so big but dont bother to get some certification or standard for comparing. blow this blow that how our filter best.

but but coway got bro.

dont get me started on that 1, they only got nsf42, which is most rubbish certification that some cheap filter also can get, and then slap some logo like 'we nsf certified', that put the whole damn company in even more sketchy position.