Ubuntu - It was my first distro and I loved it for many years after 6.06. However, it slowly shifted from a very community focused distro ("Linux for human beings" was the original slogan) to a very corporate distro with lots of in-house bullshit, CLAs, and partially-closed projects that seems to focus on profit and business over actual human beings. I correlate this move to around the time when it became purple rather than brown. Snap sucks, Mir sucks, Unity sucks, integrating Amazon and music store paid bullshit sucks. Just no. Move to Debian.
Manjaro - It's Arch, but with incompetence!
Red Hat - Do you enjoy paying licensing fees for a Linux distro that very likely violates the open source licenses it uses? RHEL is for you! Just remember not to share the code! Sharing is most certainly NOT caring!