HTC's Sense is a lot better than it used to be. A lot of people say it's the only manufacturer skin worth a damn (compared to Samsung Touchwiz, and whatever it is LG calls their skin). Like others have said though, the new HTC One M9 should be coming out soon so I'd at least wait and see what that brings. As far as Samsung...I really really don't like Touchwiz. Apparently they've made it "lighter," meaning it's not as intrusive, but I'm still not a fan. The LG G3 is a really sweet hardware showcase, but it's got some drawbacks. The screen doesn't get very bright, and if you do have it set to maximum brightness they sometimes overheat and will dim the screen until the CPU cools down.
If I was on Verizon right now and had to pick an Android phone it would be the Droid Turbo. Nicely sized (5.2"), high resolution screen, very light modifications to stock Android, and a really nice sized battery. I've heard that Moto's camera software isn't the best, but I believe it's got a 21MP camera.