I used Ubuntu Mobile for about half a year and SHR for a few months. I woukd use SHR again if/when it gets ported onto my phone.
There's about a dozen "linux" flavours compiled specifically for mobile devices, I've read what sorts of experiences other people have had with some the linuxes I haven't tried myself.
Mobile linuxes are good compared vs Androids. But not great in the same sorts of way that desktop linuxes are awesome vs Windows/MacOS.
They tend to come with all the standard phone apps you'd expect. Good apps, arguably even better than stock Android apps, definitely not as good as the better/best apps you could download on Android.
They tend to havr limited device compatibility. Your phone model is on the short list or it's not.
They tend to require some linux knowkedge. You don't have to be a linux guru but you might sometimes be unable to do simple things (like install an app) if you can't command-line sone bash and shell sorts of stuff.
They tend to give full user control over everything. But with great power comes great oops if you don't know enough stuff.
There's a lot of dedicated fanatics working to make mobile linux Really Happen. And they know their stuff. And I think they really will prosper, eventually, because more people hate Apple/Google/Microsoft every year and more mobile devices keep connecting every year. Mobile linux needs a decade or so to become what desktop linux already is. But in the meantime, Android or iOS are definitely smarter and better choices... more available, more compatible, more upgradeable, more software, more options, more simple, less hassle, no brainer.
