Both of them are good and use in the separate usecase. Some people hodl their coin/tokens because they believe their coin/token pice will rise in the future and they need to research it a lot before deciding which one is good to hodl for a long term and sometimes they hodl some coin/token when they feel the coin/token price already reach bottom.
And for trading they only do buy and sell to get a profit in the short term. But its not easy to be a trader, you must able to take action when to close your position, analyze the fundamental, etc.
So both of them is different.