Originally posted by BarryE I've so far concluded the iiix would be more restrictive.
I find the horizon is a little tricky to get straight off on the iiix, it may be I need more practice on that to get there quickly.
As noted, pressing the rear rocker brings up the screen brightness option, which is necessary in bright sunny conditions. This aspect is no worse than using a phone but the solution is quickly at hand and once set for those conditions you are good to go.
I would not consider a viewfinder as it would kind of defeat the purpose of the camera.
The rings on the front are detachable and come in all sorts of colours, so use a different one on the iii and iiix.
As for owning both, I could see a case for it and the frustration of having the wrong one in hand when you need it.