No, it's not an easy answer, you target the platform that will have the best sales when the product is released (say, 12 months in the future). Further complicated by the fragmentation of the Android platform. So now you've got the Play store, Ouya, Fire TV, and a dozen other Android platforms that you may need to customize for, each with varying hardware specs, so it's hard to predict if your game will perform as expected. Then you compare that to the Steam ecosystem, Windows, Apple, Wii U, XBone, and Play Station.
So, smartass, what's the gameplan that's going to target the greatest number of the right kind of users while minimizing development and administrative overhead? How successful will these various platforms be a year from now, and how crowded will their various marketplaces be? How many other games on that platform will you be competing against? It's a very complicated puzzle to try and figure out.