I think the beauty of these kinds of builder games, is that you can play both of them at the exact same time. Even if FG has better functions, better quests, better story, better everything, is that a real reason to uninstall TSTO after all this time we put into it. No, thats ridiculous.
Your still going to have to set your characters to tasks in FG, and wait around for hours to finish them. What are you going to do in the meantime? Work? Pshhh. No, right now when you're not playing TSTO, you're on the TSTO forum. You're not going back to work. You're going to play Family guy, and then you're going to play TSTO, and then you're going to visit forums to talk about both of them.
Both games can occupy the same mobile device, and your time can easily be juggled between both. You may only want to spend your money on one of them, if you spend money at all. You may only want to visit neighbours in one of them, if you spend time being a good neighbour at all. Regardless, both games will make a ridiculous amount of money, just as Smurfs Village continues to make ridiculous amount of money, in spite of TSTO completely outclassing it for 2 years now.
Objectively speaking it is impossible for one of these game to kill the other, just as both cartoons, in spite of all shots fired, have not killed the other. That's not even my opinion. That's just how its going to be.