Powerbear vs yishda?

[pawprints86]

These are the 2 I'm frequently seeing, on amazon.ca anyway... Which is better? Are either susceptible to being a knock off? Has anyone ever knocked off a knock off?? There's zero lemon too but those seem to all be for the extended one at least that I've found so far

I only have experience with OEM and anker, which I can't even get anymore.

Which is suggested?