Let me start this faithful and very late review. The college has been trolling me and so time is of the essence.
Before you ask, yes, I will discuss which of the two versions I like better but LATER. For now, I shall appreciate it as its own thing.
Let me start with the story. It really is a story of life, youth, and time. Things happen to the main character that changes her world view whether it is realizing that it can't always revolve around a boy or that certain things take responsibility and she needs to be held accountable. As for being a remake, I love some changes and I thought some others were better left alone. Some scenes kept did not have as much impact as the original and some scenes changed both fell flat and brought the bomb. There was variety :) The beginning was especially rushed and fast-paced due to the difference in episode count but I did feel that they could have done a better job. After around ep 3-5, the story worked itself out and got back on pace. True to the original but able to make it its own :) got to love it.
The Acting and Cast? I loved it. There was no moment where I thought :/ or really wished someone else took the roles. What else is there to say? I felt that I could tell by looking at the character and the way they all spoke which their Chinese counterpart was. I feel that is one of the greatest compliments to a cast for a remake. I also enjoyed the dynamic and watching them really dawned on me new possibilities because I couldn't really imagine a new cast up until that point.
The OST? I will be singing it all day. It was actually what initially attracted me to watch the show other than the original. Whenever the song came up I was tapping my feat, humming along and my head swayed without my knowledge at times. This one song alone probably had more impact than most things. It was very enticing and really kept me watching. I still listen to it. I actually can't pick between this version or the original version of the song but it was a nice throwback surprise.
uhhh as for rewatching value...I actually gave it a 7 because it seems like a rewatch friendly show but I haven't rewatched it soo I can't really judge it quite ye. I haven't done a review for the original so I might rewatch both at one point to have a better opinion.
Overall, as a stand-alone it was great.

Now, THE STATEMENT of which I liked better.
It doesn't matter because I like both!! Like or dislike is a preference that has no bounds, if you want to discuss which one is objectively better as a critic, go ahead but preference is a number of things. There is really no winning no matter which one you liked more. I get flamed for liking the new one and I get flamed for liking the original because people think I am biased. Nostalgia is a factor, my dudes. Don't flame someone cause they liked whichever one more for whatever reason. Doesn't devalue or opinion or anything so why does it matter. It is not like you are gonna agree with them and turn a new leaf. haha, I apologize, a bit too charged for my taste but I needed to say it.
Which one would I watch again first? The original. Does that mean I like the original more? I don't know. If you really want an opinion, just watch it and form your own. It was a good show on its own and it managed to be a good remake as well. The original will always hold a place somewhere on the popular drama wall and people liking this remake more won't change that.
My opinion on what was better for each category :
OST: Korean
Story: Chinese
Actors: Tie