I have a nexus 6 and my wife has a z3. Both are great phones, and we each prefer the one we have!
The z3 has a better camera and battery life. The Android skin is OK, nothing too special. I prefer the pure Google experience, which is why I'm sticking with the nexus line (I had a nexus 4)
The z3 is easier to handle and use one handedly, but the nexus 6 is more manageable than I would have imagined. Also the z3 is very slippery, and since its back is made of glass it is quite fragile. (and if you break it and want to keep it waterproof -- and it's awesome to have a waterproof device --, you will need to return it to Sony).
Both have good front facing speakers, but the Sony ones are better I think.
I'll edit if I can think of something else worth mentioning.
Posted via the Android Central App
02-09-2015 06:02 AM