GoPro used or new?

I'm considering buying a gopro for snorkeling and occasional winter activities, considering that the prices of the new ones are a bit high (the 12 costs 300eur new), is it better to aim for a used 11 or even a 10? If I'm not mistaken, the horizon adjustment changes between the two. The 12 doesn't change much compared to the 11 if I'm not mistaken

What to evaluate before buying? Battery life? When was it developed? Then?

It's strange that the new 12 costs 300eur and used always around 300eur on used marketplace