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.
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Myfitnesspal

Free Calorie Counter , diet and excercise journal.

Tried several. Like its integration with other apps and products (i.e., Withings, etc.).
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