Apple is my vote. It's very easy to be a tech professional who uses a lot of tech in my free time and never rely on, interact with, or even think about Apple products beyond users that may be using them. Therefore, it's easy for me to imagine a world where Apple just doesn't exist, and not because some unknown competitor rises up. However, I don't think that is particularly likely.
(1) I keep hearing fantastic things about their new M1 processors and laptops, and it actually has me slightly interested in Apple for the first time in my life, so that's impressive.
(2) Just the extreme loyalty among people who are Apple customers.