I am using now since 2015 ubuntu touch as my only mobile system. I bought at that time this wonderful BQ E5 (which is now broken ;/). Today I use a N5 which runs brilliant with ut.
I have started to have a look at other linux mobile systems. These experiences I would like to share here. I am sure that such a view to the others can improve ut (and the others too) a lot.
The following systems I have already tried: