The latest version.
Atlassian do a lot of testing to try to prevent shipping anything with "major bugs". We can argue about design flaws, but it's very rare that an "major" bug goes out in a release. It's quite sad that you feel you need to ask - it tells me you've got used to using software that is badly tested and/or rushed out when it shouldn't be - there's no excuse for that nowadays.
Anyway, you should look at the current latest version, test it, and go with it if it works for you.
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