Thick stamp vs thin stamp. consequential difference?

Just got back into the hobby, and managed to buy a small collection for the criminally low price of $300AUD on gumtree. Among other things, it included a psa8 base machamp and psa8 shadowless machamp. Just wondering if either of them would be considered thin/thick stamp, and if so does that have any effect on the value? Did some research and found it difficult to determine which (if any) is more desirable.
imgur.com/a/qnXyok1

Thanks in advance!

both are thin stamps