YouTrack is pretty great. So is TeamCity and they integrate well. The JetBrains instance is open so you can just sign up for an account there and play with it. Also you can run them both on-prem and they're pretty easy to admin if you do.
Space I haven't used. It seems like an attempt to reinvent both products in a GitLab style product which is a pity because the JetBrains tools are very mature and I don't think they needed a new product.
Space I haven't used. It seems like an attempt to reinvent both products in a GitLab style product which is a pity because the JetBrains tools are very mature and I don't think they needed a new product.