Anecdotally I've had a lot of problems with Anker products over the years. On two separate occasions my power banks died while I was travelling. I had a few Ravpower products that were at least as good. And now Ugreen seems to be producing good stuff.

I don't think there is any stickiness here, and it's a cutthroat market. These things are all at a price point where there will never be a winner-takes-all.