Which is the more stable and recent vertion of Jira?

[Karthik P]

We are currently using Jira 6.3.11 and we are planning to do an upgrade.

We are deciding between JIRA 6.4.12 and JIRA 7.0.x.

We want to move towards a more stable version.

[Phill Fox]

You can see the version history for JIRA Software at https://confluence.atlassian.com/jirasoftware/jira-software-7-0-x-release-notes-776997721.html and for JIRA 6.X at https://confluence.atlassian.com/jira/jira-release-summary-159154300.html. 

These also describe what was different between the versions - a clear note of warning for version 7.0.8 on mySQL but apart from that all versions should be stable.

[Nic Brough -Adaptavist-]

"Stability" is pretty much irrelevant in this choice, you really should be making the choice based on requirements (although, I tend to avoid the very first release of a major version - 7.0.1)  I'd always recommend 7.0.latest over 6.x though, as it's got better functions, and you'll end up upgrading the 6.4 to a later version eventually, might as well do it now.