Where would we be without our mobile apps? Seriously, if we didn't have apps on our smart phones, life would be, well, a bit more difficult. Where would we share our photos? Instagram does a great job of connecting and allowing us to see what our friends are up to, and vice versa. How would we know how much quality sleep we have? You probably wouldn't know how much physical activity you've undertaken without your Health app.
That said, what is the best mobile app? Do you get your music from apps like Spotify or Pandora? If you have an iPhone, is it the Apple Music/iTunes app that keeps you rockin' all day? Keeping your finances in order is also key, which is perhaps why you love checking your bank's mobile app. Better yet. you can know pay people you owe money with the push of a button with the Venmo and PayPal apps.
The best mobile apps are able to give us information about ourselves, save us a few bucks, and even keep us healthy. That's what they do, and that's their story. Pick the one that's the most valuable to you.