Well i really didn't want to post in this thread again but after playing with both the phones in store i have to just put in my comment... but only as my OPINION. I'm sure others won't agree with this.
When i felt the HTC One it felt... well actually kind of cheap somehow, again just my opinion but wasn't say on par with the iPhone i think if thats what people are comparing it to. It could also be the weight throwing me off since both the One and S4 were lighter than my 4s. The white plastic edge around the entire phone really offsets the nice aluminum unibody back of the phone. From the front or back the phone looks great, but when you incorporate the sides in the picture it just didn't give me that "premium" look that everyone else has been talking about. The slanted edges of the phone made me feel like i could easily drop it and being aluminum i would be holding this thing with a death grip. Yes lots of people put cases on their phones and i would agree i would want a flat edge case to put on this phone. Thought the screen was a good size, but thats coming from an iPhone 4s, so either phone's screen is huge. I've really gotten used to the home button so i felt kind of "lost" on the HTC One. I know theres a home button, but being off to one side like that is just, well something you'd have to get used to, nothing terrible about it, if i was getting this one i could deal with it. The buttons being so flush with the rest of the sides i could easily see me missing them a lot. and yes i'm a right handed phone user so they were a bit awkward to use with the right hand only but again i could get used to it. Great screen, the camera quality looked really nice, i wouldn't have any complaints with it. I looked at blink feed for a second but being that i wouldn't use it, i just kind of skipped over it. The software was very smooth, however AT&T had what they called a "demo" mode running so some things were working while others weren't and it kept going back to the video it wanted to play so it was kind of annoying.This also happened with the S4 but i'll get to that.
Picking up the S4 just as i thought i loved it immediately. It felt like it belonged in my hand. The weight of the phone threw me off like the HTC One, but just something i'd have to get used to. The flat sides are what i was expecting unlike the slanted sides of the One. I saw lots of smudges all over the back, but i'm pretty anal about keeping my phone clean anyways, so i'm sure i'll be wiping it on my shirt multiple times a day. It'll get annoying but i'm going to assume its because of the plastic. I could see the camera sticking out the back a little being a problem, but because i have my phone on silent most of the day and vibrate on, i put it on a pad or makeshift stand so that should be off my desk so thats something i could deal with. With the plastic i felt like i didn't have to grip it as hard as the HTC one and i wouldn't have any issues holding it. So glad i'm going to go caseless for this phone! I really like the metal/silver plastic band around the outside of the phone (i say both because i've seen multiple sources saying plastic and some saying metal). The screen was beautiful!!! so bright and big and very responsive. I didn't notice any lag at all. Again with this phone AT&T had some demo crap running so things like airview were not working even though that was one of the things on the "demo" video it was talking about. But the swipe to change pictures etc was working so i guess i'm not sure what was up with that. and yes the air view setting was on. As this was just a store demo phone, i'll wait till i get mine in person later this week to really test everything out.
So you can take this as biased or not. I was really trying to give the HTC One a shot here by picking it up and playing with it, and giving an honest opinion on any deal breakers or not. Honestly, the only real "deal breaker" would be the slanted edges and flush buttons. The sides can be fixed with a case, but that may make the button problem worse depending on the case. So really for me its just a matter of opinion on phones and i have more positives for the S4 for myself than i do for the HTC One.
But being that this is an S4 Design thread plus the fact that i'm getting an S4, i'm so excited to get this phone later this week!!! Its a beautiful design, all the buttons were great and responsive, easy to hold reach everything. This is going to be a hell of a week waiting for it! Haha