Yes, I've been using Ubuntu Touch since 2015, as my only mobile OS on multiple devices, I'm also involved with the UBports Community, that maintains and develops the OS. I like it and it fits my needs, however it might not be for everybody, as there are way fewer apps, including some that many people expect to have.

However if you want to have an alternative OS, not based on Android, that is GNU/Linux with the necessary arquictecture changes to be reliable on a daily driver mobile devices, and that respects your privacy, then I believe it's the best choice.