Phone app is fine for being a phone app, provided your phone is beefy enough to run it. (Which is exactly why it needs more customization options, graphics, guild, forums, live chats and a kitchen timer added to it. It doesn't use enough resources of an already limited piece of hardware. ) PC is better for now, but we'll see how it goes once they finally break free of Adobe Flash and unify the game clients.
Right now, I only use the app to see if there is some news posts, to build decks while not near my computer and maybe check DT rewards.
I hate the battle screen and interface for the app and much prefer the PC battle interface. However, the collection manager on the app is a step in the right direction and is much better than the previous one.
So, right now PC > app
You got a point NayrSlayer indeed i agree but if u guys want to finish the daily quest in five games in which u won 5 games then I would have to go with the phone
But i like the Pc for marketing and i like seeing the background , so we all have our own points