My favorite game in Android is Clash of Clans. I've been a fan of this game since it was released. I was very active before but I became in-active because of my Job. In the past few months, I play again and found a way to manage time in order to progress my account. I don't have a choice but to use a bot called clashfarmer.com. Every update of the game it gets updated as well so I'm glad it's still working after the Christmas update. Clash Of Clans is still the best and I will find ways to play it in future.
I don't understand if it is my favorite or anything but I used mostly Facebook and Instagram on my phone. Other than that Asphalt 9: Legends is the one that I used most often. And yes, it is my favorite game.
I have many favorite apps but most of them I like WhatsApp just a few days ago I downloaded a modified version of it from this https://gbapps.net site and I am using it from this modified app I like WhatsApp even more I can use good features like running two WhatsApps at the same time and removing the blue mark from messages to hide the last view.