pretending for a moment that the display is good. the camera is decent for a phone and the bootloader isnt locked down. then...
It comes down to gimiks and whats usable and the OS.
S4. touch wiz, not a fan. looking away pauses movies and such.. ok. wave my hand over the screen to answer. interesting but useless for the most part. IR blaster, so unlock my phone and launch an app or grab my tv remote. 40000 options of crap that I will never use. the S4 camera is a great example of this. some cool stuff but over all, holy cow. so much uselessness.
HTC one. Sense UI. i like this more then touch wiz but and has been trimmed down but its still not android. Zoe, pretty cool. Blink feed.. irritating at best. boom sound.. def my fav part of this phone. i like a strong speaker. button layout. wtf is with that? HTC in the middle? confusing as hell. a week with this phone i still pressed that stupid HTC logo a 1000 times expecting something. good build quality. also a strong selling point.
Droid Maxx. Almost stock android. super simple UI for the camera. (have this UI on my Gnex and i love it) the phone is always listening. Now, this is interesting. So, im making dinner.. my hands have crap on them but i want to text my daughter and see when shes gona be home. I see this as a very useful feature. something I would prob use A LOT. The shaking the phone to launch the camera seems useless. cute at best but over all pointless. the mirror thing that works with the netgear box (i think it was netgear) to send it to your TV. basicly a HDMI port via wifi. I use my phone a ton on my TV for movies. so again. something i can see as useful.
So in the end, if the maxx turns out to have a nice display (dont care what it says on paper, when i have it in my hands ill go off that), a good camera (once again, in my hands and ill use reviews to judge this) a solid speaker. I use my Gnex speaker a ton and man it sucks lol. I need loud! and an unlocked bootloader then im sold.
I think what has me really considering this in the first place is the fact that Moto, with all there flaws always delivers on 2 fronts. 1, great radios. and 2 great build quality. You cant argue those 2 points.
If this turns out to be another flop for Moto.. then Nexus 5 is what ill be waiting for.