Comment by merb

I used both. While Atlassian didn't included everything by default and misses lots of features (due to their plugin system which means that they don't necessary think they need to implement stuff) and Atlassian uses more resource and does not support git:// urls only the ugly ssh:// once. If I think back I should've never switched from Jira+Stash+Jenkins, however we did the Switch to GitLab and somehow I'm not 100% happy. It's way way slower a lot of things in CE are just missing and the costs for our < 10 user company would be way higher with gitlab ee. gitlab is easy to upgrade and the maintance feels a little bit more easy since jira/stash backup is way more complicated. however the jira is way better at managing issues (even the lightweight version of the boards is more simple and easier to use) and stash is extremly fast compared to anything on gitlab. at the end everything has their tradeoffs, but I would prefer the Atlassian Stack since it never broke anything, while on GitLab we often run into issues (especially CI related)