I use the iPhone 5, but have used many Android devices from basically all the major manufacturers. The One and GS4 had me very curious about switching, unfortunately they couldn't quite sway me enough yet. Keep in mind, I only used them briefly in stores, but have researched and read forums in depth. This will be my opinion and you may find it subjective.
GS4: amazing screen to body ratio, very vivid. not as fast as it should be, noticed some lag but nothing major. very thin and feels well built. touchwiz menus are very subpar, the blue bars at the top are just plain ugly. quick settings in notification are great. menu button on the left is nice to have. the space between the dock and the first app row is horrible, so much wasted space and no excuse for this. it simply does not make sense.
HTC One: best screen quality ever. very accurate and true to life, and more usable in sunlight. the screen to body ratio makes the screen seem smaller than it is, and it is a little too narrow like the iPhone 5. much more fluid and quicker than the GS4 while just scrolling around and clicking through things. I'm not a big fan of Sense 5. forcing facebook into pictures, not allowing to disable blinkfeed without root, and screwing up the ease of adding icons to homescreen is ridiculous. these people get paid to get these things right, I don't get paid for that and still could've given them this simple advice.
I like Android and iOS equally, but if the iPhone allowed me to set default apps, add quick settings to the notification center without jailbreak, and made the screen bigger I'd be perfectly happy and not want to switch. I did give these two Android phones a chance to sway me, and the little annoyances they had hindered it. I'm not interested in rooting and jumping through hoops to make things work as they should. When I pay top dollar, it should work mostly perfect as is.
(note: I know this wasn't typed very neatly, but I was just writing everything down as it came to my mind. I apologize if it's annoying to read lol.)
GS4: amazing screen to body ratio, very vivid. not as fast as it should be, noticed some lag but nothing major. very thin and feels well built. touchwiz menus are very subpar, the blue bars at the top are just plain ugly. quick settings in notification are great. menu button on the left is nice to have. the space between the dock and the first app row is horrible, so much wasted space and no excuse for this. it simply does not make sense.
HTC One: best screen quality ever. very accurate and true to life, and more usable in sunlight. the screen to body ratio makes the screen seem smaller than it is, and it is a little too narrow like the iPhone 5. much more fluid and quicker than the GS4 while just scrolling around and clicking through things. I'm not a big fan of Sense 5. forcing facebook into pictures, not allowing to disable blinkfeed without root, and screwing up the ease of adding icons to homescreen is ridiculous. these people get paid to get these things right, I don't get paid for that and still could've given them this simple advice.
I like Android and iOS equally, but if the iPhone allowed me to set default apps, add quick settings to the notification center without jailbreak, and made the screen bigger I'd be perfectly happy and not want to switch. I did give these two Android phones a chance to sway me, and the little annoyances they had hindered it. I'm not interested in rooting and jumping through hoops to make things work as they should. When I pay top dollar, it should work mostly perfect as is.
(note: I know this wasn't typed very neatly, but I was just writing everything down as it came to my mind. I apologize if it's annoying to read lol.)