We are quickly approaching a new Android release with the official unveiling of Android 7.0 Nougat, and not all phones will be getting that software quickly. That makes your decisions at this time somewhat more complicated. There are some great phones available from your carrier, but unlocked phones get updates faster. What's an Android nerd to do? Let's sort it all out.
Things are simpler on the carrier side this month with very little change. You should consider the Galaxy S7 and the HTC 10. If you're on AT&T, you won't be able to get the HTC 10 direct, so that's an easier choice. What of the LG G5? I think the only reason you should pick that phone up is if you really, truly cannot live without a removable battery.
Let's start with the Galaxy S7, and why you might want it. Samsung is still using a solid metla and glass design for the GS7. The glass back will collect fingerprints like mad and you could damage the body of the phone if you drop it. Samsung made the GS7 about a millimeter thicker than the GS6, which might not sound desirable, but there's more room inside for a bigger battery now. The glass panel on the back also has curved edges to make it more comfortable in your hand.
The slightly thicker frame means the regular GS7 has a 3000mAh battery, and the GS7 Edge has 3600mAh. Both phones are also water resistant, which the Galaxy S6 wasn't. The Galaxy S7 and S7 Edge have new Super AMOLED panels at 2560x1440 resolution. The GS7 is 5.1-inches, while the Edge variant has a larger 5.5-inch display. The Edge, of course, has a screen that curves down on the left and right edge. The Edge phone does look very nice, but it's not as comfortable to hold thanks to the larger size and narrower metal band around the rim due to the Edge screen. None of the software features that are supposed to take advantage of the Edge display really do anything special. Most of them would work on the regular phone too. It's just an arbitrary attempt to justify the design.
Samsung is using a Snapdragon 820, which is a quad-core 64-bit SoC that's easily as fast as last year's octa-core parts. The GS7 also has 4GB of RAM, and it multitasks much better than the GS6. There's also a microSD card slot in these phones, another improvement over the Galaxy S6, but it doesn't support adoptable storage in Android 6.0.
Samsung is using a 12MP camera sensor this year, and the performance is really impressive. It has excellent low-light clarity and color balance, and the outdoor shots are realistic and vibrant. Samsung also implemented an autofocus technology that lets it use all the available pixels to locate the subject. I've found this to be faster than any other phone, even those with laser autofocus sensors.