Specs are quantitative aspects of the option such as the price
Pros
Pro
Free with no limitations
Both public and private repositories cost nothing to host. You can have any number of them as well as any number of collaborators. The platform itself is also free (libre) and open source software.
This means you get a wiki and a bug tracker that you can work with locally offline and both are version-controlled. You are also able to customize, e.g., the look of your project's repository if you want to.