It's at times like this, that I'm especially grateful I've had the money, time and desire to test Most of the top of the line, popular iPhone Battery Cases.
Nothing beats first hand experience and ownership for my curiosity.
Mophie still has the best, nicest looking, long lasting battery cases of all.
When it comes to external batteries ANKER is the brand that I find exceptional.
That said I do understand the emotional connection to Apple's products many users have. That they choose Apple and proclaim them the best does fall in line with Apple's wishes.
Viva Le Difference
I'll take third party accessories in this category. 😀
Very fair to say and to each their own for anything. The term 'best' is a subjective and personal term, I'm not here to say it should be your best or anyone else's best, but it's the best I've ever used.
It's ergonomically the best for any I've tested - that includes the Mophie, Anker, Lenmar, and LifeProof.
It's the most convenient case, as the only time you ever interact with it, is when you have to install the case. You don't have to learn new interactions, remember to do anything, or need a new set of cables - you simply install and you have more battery capacity, that's it.
It's the most comfortable I've ever used, as silicone is one of the best materials for grip and therefore maneuverability in my hand, without needing to hyper-extend and fingers to reach certain areas of the screen. The design of the battery in the back may be unsightly to some, but fits best in the hand when compared to any other case I've used.
The case is definitely not PERFECT though. Silicone is a terrible mess to keep clean and for the value you pay for the case, you're getting a much smaller battery capacity than others in the same price bracket.
Sure, I love Apple, you can call me a fanboy, but in the end, the Apple Smart Battery Case meets all my needs, which makes it the BEST for ME.