I prefer to hold both for a very long time. As we can see from what happened for the past few years of crypyo, Bitcoin has always been on the very top and right next to it was Ethereum. Regardless of the crisis both has experienced before, they were both able to keep their positions and stay on the very top amidst all the new altcoins being released. They are the pioneers and they made it so far which makes them deserving for the recognition and acknowledgement of being the best coins in the market for a very long period of time.