Both are really good, but the US remake to me was just way more relatable, maybe because of my own biases.
It is able to create this atmosphere that just draws you in and makes you uneasy throughout the whole movie,
and the Japanese original just didn't really do that for me to the extent the US version was able to.
I think it is the only horror movie that I have rewatched multiple times as well, and I still get that feeling.