I've written about the "Siri Remote" for the Apple TV many times. It's small, slippery, and extremely easy to lose in couch cushions. I don't like it.
The iPhone has a Remote app that lets you control your Apple TV, but that also means fetching your iPhone (which, also being slippery, sometimes gets as lost as my Apple TV remote).
The Apple Watch beats these other remote options handily. It stays attached to your wrist, meaning you can't lose it, and summoning the remote is as easy as clicking the side button to access your Dock, and tapping on the Remote app that appears — just two quick steps.
The Apple Watch Remote doesn't have Siri for quick searching, but it has everything else — multi-touch control and buttons for play, pause, and the menu. It's the fastest way I've found to control my Apple TV.