The Ford Mustang and Chevy Camaro are each better because the other exists. I think Apple users should be especially happy when Google enters the game.
Friend of mine decided to go phoneless -- borrowed an iPhone 6S from his QC department and used it to activate an Apple Watch, which is now his sole mobile device.
If you're leaving it at home anyways it doesn't need to be pretty or fast. Just needs to allow you to set up the Apple Watch.