I won't go into much detail because others have already shared the strengths of the Sony SW3 in more detail, but I do want to mention a few things. Keep in mind I've owned the LG G, LG R and Moto 360:

1. 
   

   I'm in love with the clean and simple design. I think it goes well with whatever style of clothes you wear, and once the other straps are released (metal, leather) it will look even better.

   
   


2. 
   

   I think the strap is great and VERY underrated. Easy to put on and off, super easy to change straps (no more dealing with annoying pins) and the SONY logo on the clip is just an extra nice touch. I especially like the way the strap and the core blend seamlessly into one and work together to conceal the bulkiness seen in other watches. This always made me feel self conscious about those and this is the first time I totally forget I'm waring a smart watch (My wife also thinks this as well). It also helps that it's super light.

   
   


3. 
   

   Battery is amazing. I can easily get through 1 day, 1 night and the next day without charging it. Right now (8pm) I'm at 34% and this is my second day without charging. Screen is always on and I go from light to moderate use. The micro USB charging is not as convenient to use as the Moto 360 cradle, but I rather be able to charge it whenever and wherever I need.

   
   


4. 
   

   NFC, GPS capable and IP68 rating: All of these are nice features to have for whenever you might need them and none of the other watches have them.

   
   

All in all I really think that if you don't mind a square design or having a heart rate sensor, this is the best Android Wear smart watch to date and I think Sony did an amazing job with it. You can really tell Sony has had experience making Watches and everything is carefully thought out and well designed.

Just wanted to share my two cents because I think this watch is underrated and overlooked by people and tech sites. But after using the main players in the smart watch space, I can say this is one of the best and my personal favorite.