Are you talking about never selling your BTC on both chains? If there really is a split one of the chains might die out and stay at purely speculative level, while the other one keeps growing. In such case it might be a good idea to sell.

https://www.viabtc.com/convert/bcc
I don't like this idea and I don't recommend selling your coins there. Who knows what will happen to those frozen coins, maybe they'll disappear forever