I vote for $Apple(AAPL)$ because of its ecosystem. Apple's ecosystem is key to its success. iTunes, the App Store iOS, macOS, Apple TV, Siri and Home all tie together. 

Apple has built resilient and sticky ecosystems by changing the way its products interacted with one another. Apple added the ability to use iMessage and FaceTime from an iPad, for example, allowing you to carry on your iPhone conversations on a tablet. Then it introduced a similar feature to Macs, also adding in support for full phone calls. The more Apple devices you used, the better they worked together.

Siri launched on iPhone and iPad and eventually on Mac and Apple TV and even the Apple Watch. It became a familiar voice to answer your questions, no matter where you were.

Once consumers invest in the ecosystem, it's harder to switch out of it because they are tied into an ever-growing, sprawling ecosystem of software and services that allow you to do more with the products if you continue to invest in that ecosystem. And that's why people will keep buying Apple products.

@CaptainTiger