Nexus and Motorola. Yes, those are the only devices I've owned since 2011. I've had a stock Droid 1, HTC Thunderbolt (terrible phone), then in 2011 Samsung Galaxy Nexus, Nexus 4, Moto X 2013, and Moto X 2014. Besides the camera and battery life, they've been the best phones I've ever owned. A lot of reviewers and people love how fast their G4s or S6s are out of the box, but months later they start slowing down considerably. The stock devices just don't have the same downsides. Unless they get the buggy mess that was 5.0... If Samsung could make phones with iOS, they would destroy it with their skins and make it run terribly slow.If you're criteria for an Android phone is one that runs stock Android, you basically are limiting yourself to just the Nexus phones.
Stock is so much more freeing than using a skinned version (even though Moto is technically skinned). But, my want for better camera software and a smooth experience has drawn me to get an iPhone this fall.