Of these, I've only seen Chinatown.
Chain Reaction (1996) - I own the CD, but it is still unopened. I have to keep a few CDs unlistened to for a rainy day! This is one of them.
The Chairman (1969) - This score has one of my absolute favorite main titles of all time. Unfortunately, I can't say I'm all that enamored of the rest of the score, though it still gets a fair amount of play time, because it's good writing music. I love the themes in the main title, but they don't figure into the score much, so I always finish listening to this score slightly disappointed. But the main title will always remain one of my favorites.
The Challenge (1982) - A good but not great score. Interesting that it follows Chairman alphabetically, because I had the two of them paired on a playlist, as they are a good match with the Asian themes. This is another score that is good for writing, but I don't really listen to it on its own.
Chinatown (1974) - Probably my favorite of the scores on this page, though I don't listen to it all that frequently. It's one I think I'm confusing with another score, as I always think I don't like this one, then I listen to it, and am like, but wait, this score is great! Nicely noir, but not all that dark.
City of Fear (1959) - creepy, dark, noirish score. Way darker than Chinatown. I should probably listen to this one more than I do. It's quite cool.
Here's the main title to The Chairman. The very first time I heard this, when it hit the part that starts at about 2:00 minutes, I burst into tears because I wasn't expecting that full version of the theme after the quiet lead-in, and it was so beautiful. What's that the kids say these days? It hit me right in the feels? Strangest phrase ever. LOL. (And yes, music often makes me cry.)