Hey, I'm the React zealot on Reddit (slash on the core team :)) I expect lots of debate from this :)
I wrote a blog post a while ago about this: http://www.quora.com/Pete-Hunt/Posts/Facebooks-React-vs-AngularJS-A-Closer-Look[22]
First of all I think it's important to evaluate technologies on objective rather than subjective features. "It feels nicer" or "it's cleaner" aren't valid reasons: performance, modularity, community size and ease of testing / integration with other tools are.
I've done a lot of work benchmarking, building apps, and reading the code of Angular to try to come up with a reasonable comparison between their ways of doing things.