FYI: Wingtra wrote a little “Quadplane vs Tailsitter” comparison.
Also anyone tested the (NEW!!!) QAUTOTUNE feature yet?? I have no tailsitter at the moment, so please guys test this and provide tridge with feedback! 
There is some advice for tailsitter:
NOTE : QAUTOTUNE does not work on axes that need feed-forward. This means it doesn’t work on the pitch axis in tailsitters. If you want to QAUTOTUNE a tailsitter then make sure the pitch axis is disabled by setting Q_AUTOTUNE_AXES=5. If you do use QAUTOTUNE on the pitch axis of a tailsitter then you will end up with a very bad (completely unflyable) tune.