Continuous Integration tools

Im doing research regarding continuous integration tools and there benefits. For my research im looking at the following tools:

1. GitLab CI
2. Jenkins
3. Bamboo
4. GoCD
5. TeamCity

Now I wont bother you with all the requirements and benefits. But so far im not finding so many differences between the tools except for these:

1. Fan-in fan-out support GoCD
2. Community size, Jenkins and GitLab seem to have most contributors
3. Costs
4. Open source or not
5. Amount of plugins available

I was wondering if some people who have had to choose a continuous integration tool aswell could share there experience and why they chose that tool and if there are certain differences that are worth thinking about before choosing which I didn't cover.

Now im leaning towards GoCD because of fan-in fan-out support and the visualisation of the continuous delivery pipeline does anybody have experience with the support on issues for this tool?

Thanks in regard,