Used to use Xiaomi, the last one I bought was Anker because I'm more paranoid. I see people open up the Anker ones for review got the protection circuits and proper BMS etc so I trust.

But actually my old Xiaomi's never failed on me also, after many years just cannot hold charge any more never expand or have anything scary happen.

Ugreen I got buy their GaN chargers as I've seen reviews of those and they are well built, so I think I'd trust their powerbanks also.

Considering how many of the cheap ones tend to explode and shit, I would NEVER cheap out of chargers and powerbanks for my main devices.

I do use some cheap chargers but those are for low power things like my cats toys, etc.