Action cameras?

I'm planning to buy an action camera - any advice?

My current choice is the SJ7 Star (https://sjcam.com/product/sj7/), I think it has a good price-quality ratio... The GoPro Hero 6 (https://shop.gopro.com/EMEA/cameras/) has better features, obviously, but the price simply soars...

I'm a bit worried about the sound, though. I know that the comparison of the audio quality against previous SJ versions was clearly on the side of GoPro, but SJ may have already improved...

Any tip or advice? Do you know of other interesting action cameras?

Thanks!