Just one detail. Samsung Galaxy Gear S is the most independent smartwatch on the market. The Apple strategy is clear: Apple Watch totally depends on iPhone. So if you want an Apple Watch you have only two possibilities: first, you already have a modern iPhone (5 or 6) and second if you can't resist the temptation, you have to go shopping and buy an iPhone and an Apple Watch! Around 1000 bucks to show off!!! (of course avoiding the Apple Watch Edition with 38mm 18-Karat Rose Gold Case). All this waste of money for a device that hardly reach 18 hours of battery life.
But talking seriously, Apple has a great and loyal base of customers. And also a lot of developers that want to take advantage (and earnings) of the new wave of wearables devices.
Tizen is new for developers. And too many operating systems for smartphones and wearables make their head a mess!
Anyway Samsung is also clever. Using HTML5 development to Tizen, makes easier for Web developers to create apps and they don't need to learn another programming language other than they already use in Web pages.