TouchWiz really sucks. I really like base Android, it is better imho than iOS - but not by a lot. If you can live without some of the apps, Windows phone has the nicest UI imho - I have multiple devices but the one I tend to take with me almost all the time is my old Lumia 1020 - granted it is mostly because of the camera which can not be touched by anything currently for sale in the US including the iPhone 6+ (the new Panasonic DMC-CM1 is probably better, but we can not buy it here) - but since I use it so much, I got used to the UI and I really like it. Everything you need to do is usually faster to find on this UI and I for one really like the flat graphics.