Binary package manager with support for environments.
Ranked in these QuestionsQuestion Ranking
Pro Binary installs
They are fast and reliable as they do not need to compile before installation.
Pro Allows for multiple environments
It is great for developers since you can easily switch between complete environments with different versions of packages, for testing and development.
Pro Open source
Conda is open source and on Github, so if you see something wrong you can fix it and submit a patch.
Con Doesn't have everything
Conda is relatively new and has a smaller user-base, so the set of packages available is limited.
Con No way to resume downloads
Any download that is canceled or interrupted will have to be started over from the beginning as there is no built in solution for resuming downloads.