From the install guide:
You can clone either a release branch or the develop branch: Release branches like 2.0 or .2.0.1 are more stable develop is more recent. Currently, the develop branch is the default but you can clone a release branch like 2.0.1 using the optional -b argument.
However, the branches list on github shows only:
-Develop (green mark)
-merchant_beta (red mark)
-2.0 (red mark)
Which branch should I clone to get the latest version for a production site?