dblplay1212
I just recently started using stockx. They actually charge 9.5% & $13.99 for shipping.. the 3% is actually PayPal's fee that they are pre-calculating. They automatically cash you out on PayPal whereas Goat gives you the option to spend the money on their site, which wouldn't ever go through PayPal.
Also, it takes time to be approved on Goat. Some people have said they sped up the process by contacting them. You can sell as soon as you setup your profile on stockx.
Oh, one other notable mention. Goat seems to be better for the seller since the prices stay pretty consistent. On stockx there are usually people trying to under cut eachother on the prices.