The GPS model suits most users for everyday needs and fitness tracking with an iPhone nearby, while the GPS + Cellular model offers independence for calls, texts, and data without a phone, at a higher cost.
If you know Apple Watch's model number, you can find the watch's release year, name, and even the region where it was produced, and my table will help you with this.
You can disable 'Now Playing' using your Apple Watch and iPhone. Using Apple Watch, open settings and select General. On your iPhone, open the Watch app and select Auto-Launch.