When comparing Gitlab Container Registry vs Quay.io, the Slant community recommends Gitlab Container Registry for most people. In the question“What are the best docker image private registries?” Gitlab Container Registry is ranked 1st while Quay.io is ranked 9th. The most important reason people chose Gitlab Container Registry is:
Good integration into the repository you build your docker images out of. Just activate it for your repo and you're done. Most of the time new projects/repo have it on by default.
Specs
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Pros
Pro Integration into GitLab
Good integration into the repository you build your docker images out of. Just activate it for your repo and you're done. Most of the time new projects/repo have it on by default.
Pro Free
Pro Web based UI
Quay.io has a beutiful and easy to understand web based UI.
Pro Most prominent alternative to Docker Hub
Quay was started by two Google engineers to serve as an alternative to Docker Hub. It was later acquired by CoreOS.
Cons
Con Tight integration into GitLab
If you're not building your docker images via GitLab CI, it's kinda hard to push images to the registry.
Con Docker garbage collection
Gitlab has very poor docker garbage collection management by default. One must read a good portion of the documentation to know what to do, so that garbage collection kicks in.
Con Acquired company
CoreOS bought Quay and redirected their energies to the CoreOS Enterprise Registry, so this product might not be here for the duration.