Features are not on par. moment.js "fixes" some date features but doesn't do well for human-readable "friendly" format parsing and emitting, such as "tomorrow" or "next friday" or "last April". Comparing apples and pears. Maybe good to use both. (PS found this on a Google search)
Yeha, moment is great but it's not on par at all. I'm actually working on an update of DateJS right now that fixes all the open bugs. It's not there yet but it's already more useful that the one available on the site.
Code (and issues if you want to open any) available here: