I keep my last seppuku for a cool fixed wing project, but to be honest dedicated airplane controllers are easier to setup. As the processors are slow (Feiyu and Cyclops are F1 based), there is basically no stabilisation, so the controllers do focus on autoleveling and navigation, which is much more easy to dial in. dRonin would need much more TXPIDs outputs in order to properly dial P&I on the three axis. Also you can go airborne even without a GPS-Lock which is a real plus for an airplane: once the plane as reached some altitude the lock is so to say instantaneous. Last but not least waypoint definition can be performed through the OSD.
1) these are worthless with unstable airframe
2) they lack proper tracking (rudder control), which makes me seasick quite fast
3) no customizable OSD layout
5) Programming diff/flaperon/spoileron is impossible without external mixers.
So dRonin is the way to go for lighweight / agile / fast fixed wing but tuning the beast is a challenge.