* We think GitHub is expensive
* We use JIRA (no real justification given)
* Bitbucket has a better price for our use case and integrates better with JIRA
Sometimes I also use bitbucket just to get away from hosting every single thing in Github. Nothing against Github (I use it quite a bit, and from what I've read their culture and ethics are good if not great), but regardless of their intentions, I'd rather not have one company monopolize mindshare
You raise an interesting point about justifying my choice of Jira. Since the topic was comparing SCMs justifying Jira seemed tangential. Perhaps I will explain in another post what our justifications are for using Jira.