All builds on the build download page are colored as well, indicating if any regression tests failed for that build. Yellow indicates that some tests didn't pass, and that in itself doesn't mean the build is unusable, just that the results are not 100% the same. Often this happens with rendered images or precision issues with geometry. Red builds you should not download unless you really, really have to, as some tests have crashed or many, many tests failed. If the background of the build is white, no failures were detected.
Production builds are always chosen from builds with zero failures and are tested. Dailies don't receive the same testing. There is a policy that the released build should be stable at all times so dailies are much more stable than the development version - they should not be considered beta builds