I am working on a doc at the moment (which should be available by tomorrow) that indicates the version of Broadleaf related to the version of the third party module you should be using. I will also be doing general triage on these modules, which includes ensuring that the latest version is released GA (or at least that process is kicked off).
To answer your question, if you are using 2.2.0-GA of the framework, you should use the 2.2.0-x branch of Paypal, even though it is still in SNAPSHOT.
Sorry for the late reply.
The Broadleaf forums are being retired as a readonly archive of questions. For active discussions and questions, check out the broadleaf-commerce tag on Stack Overflow
which is actively monitored by the Broadleaf team.