What's the best fitness app?

Ideally, I'd like one app that tracks both diet and activity. I currently use MyFitnessPal to track what I'm consuming and Strava, sometimes, for my workouts.
Evan Thomas PaulVP Products, GuideStar · Written
I use Strava daily. The combination of social features, solid integration with Garmin and other fitness hardware, and helpful analytics makes it a killer (cheap) app for runners and cyclists.
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