If I were holding BitcoinGold I have to observe the market first before selling or let it stay on wallets for about a week or a month because it is just new and hope that it's price will go up high the next days and months. But it actually depends on you because it's yours and let me ask you since BitcoinGold is a newly born alt of Bitcoin, isn't it vulnerable to replay attack? I recommend you have to wait until everything is okay before making decissions. I don't actually have those coins but if will do the same as what I've said above just to be safe. For me the best way is to hold it because it is just a free coin it doesn't matter if it's price will go down just think of it as risky investment just wait for a timing and if you find out that you already have profit then that's the time to decide whether you are going to sell it or still hold  your free BitcoinGold. But yeah it's all up to you.