On the Dart Editor page we can choose between 2 channels : dev and stable. What are the differences between them ?
This post of Rico Wind explains that very well :
dev channel will be something like the integration builds we offered before, i.e., weekly or biweekly releases.
stable channel will only get critical bug fixes and otherwise be updated to a new minor version with something like 6 week intervals (this is not a guarantee, some releases may come faster some may come slower).
Dev channel will, as the name indicates, have a higher probability of containing bugs, but you will get access to new features/performance improvements faster.
See also the announcement : Presenting Dart channels.