It all depends on what the trader's aims. It is better to use the strategy of separation. You need to quickly sell part of the investment when the prices will rise but at the same time you should have long-term investments in your portfolio.
In my opinion it's better to have long term and short term investment in trading, because if you have long and short term investment you can sure that you will earn or gain profit. Other than that you can assure that when price of coin you choose is raising up and over to your short term investment, maybe the long term amount you choose will be reach too.