Trying to decide my next read, wondering if anyone here had a strong reaction to either of these two books (The City & The City and The Dream Master)

I'm currently reading Grass, by Sheri Tepper. I'm now on chapter 16, out of 20, which means I'll be done with it in a day or two. There's two books I'm thinking about reading next: The City and The City, by China Mielville and The Dream Master, by Roger Zelazny.

Does anyone here have strong feelings about either? I have never read anything from these authors, but I have heard good things about them.