The "which one should I get?" question is one that is difficult to answer and likely to get different answers depending on which form you asked. I am sure the folks in the Pebble will give you valid Pebble recommendations in their forum, same for Gear, AI, HOT, Onate, etc. Here, you will get SW2 recommendations.
I looked at all and chose the Sony obviously. There were/are things about each design I liked and disliked. I like the community aspect of the Pebble and the greater number of apps/extensions available to customize the watch, especially the watchface. I like the build quality and looks of the SW2, and the ability to use touch instead of buttons. Plus most of the functions I need are covered by the available extensions. My biggest gripe continues to be the limited number of watchfaces... I envy the complete customization available with the Gear (eg. recreating a high-end watch face like a Bell&Ross, Omega, Breiltling, etc). And even the Pebble offers way more and way more functional watchfaces... eg. one that shows time, weather, and notification counts).
Ultimately, I think the real winners will be the next gen of true "smart" watches. Whether its the gear 2, or something like the Omate. Where you can completely customize with ROMs and add functional apps from the Play Store. I don't know if cameras and calls are that big of a deal, but I really think the smartwatch has to be more than a notification window and more of a smartphone extension.
My two cents... discounted as usual.