Here’s a very useful link for a website that does speaker sound comparisons (you can hear directly, A-B comparison) between many various speakers with lots of Anker models included.
He basically records different types of audio tracks using the various speakers from two different distance points (microphone to speaker) at two different volume levels under the same recording conditions. The website then allows you to select from the different speakers (two at a time) and hear a direct A-B comparison between the two. I found it very interesting to hear the subtle differences between the models (the Anker/Soundcore model were of special interest of course).