I've gone back and forth between initially being an iPhone lover (back when they first came out and up through about the 4) and then switched over to a Galaxy S4... and even upgraded to the s5 Active. I recently switched back to the iPhone 6 Plus though, which has become my favorite phone ever by at least two orders of magnitude... that's geek speak for "I really like my iPhone 6 Plus".
The main reason I like the iPhone is because it just works... smoothly, and cleanly. I don' have to tap 4 times to get a flashlight, or to change the screen brightness, or to find directions. It's almost always just 1 or 2 intuitive taps.
Android phones have more configuration settings and options, but that means you have to configure settings for just about everything just to get it working the way you want it. And honestly, I never could figure out how to control notifications... and I consider myself "fairly technical" ;)
What about you? I'd like to hear what phone you prefer, and why you like about it. What makes it something you'd never trade because you like it so much, or on the other hand makes it something you can't wait to upgrade because you hate it so much?