There are a lot of great smartphones out there, if you like phablets.
But if you want a good and fast smartphone under 70mm width, there is not much choice: Xperia Z compact (1/3/5) or iPhone (5S/6/6S).
I prefer iOS on tablets, but on smartphones, both Android + iOS have their advantages and disadvantages.
Finally I chose the Xperia Z5 compact (32GB internal flash memory) last month and I love that phone.
- Great performance, which ain't wasted in ultrahigh resolutions (graphic performance between iPhone 6 and 6S)
- great battery life + clever stamina mode
- waterproof + dustproof (IP65 + IP68)
- very good sound
- much cheaper than an iPhone 6, especially if you want 64GB flash memory or more (supports up to 200GB SD-cards)
- remote play (PS4 connectivity)
- DualShock4 support for PS4 remote play, Android games and emulators