I keep my XRP tokens in binance and will wait for a snapshot on December 12th. Many people say that you need to sell tokens before taking a picture, because they will collapse, but I think that this will not happen.
You need to prepare your token until the snapshoot already taken. If you are holding your coin in binance and you should wait until binance will have distributed your spark token to the your account.
If you are selling your token before the snapshot and you will not be eligible to receive your reward. Keep in your mind if that will be a competition to dump XRP.