I thought Debian were moving towards "pagure" (developed by Fedora)? https://anarc.at/blog/2017-06-26-alioth-moving-pagure/

Then I saw this, which dates from August 2017: https://wiki.debian.org/Alioth/GitNext/GitLab

Personally, I work on a medium-size free software project, which has to choose between JIRA/Confluence (current), Github (where pull-requests currently happen), custom CI scripts/infra with Jenkins and a patchwork of other stuff. So far, Gitlab is the best option.