Holding is a very stressing strategy. You may be rich or poor in one day. Trading is good as you can lower the risks but if you're not free then you can't now do anything at the right time
Its the other way around, trading (day trading) is stressful than holding. Imagine a day trader have to go through when he bought a coin and within a day he needs to sell it with profits based on his personal goals, and that can't be done without monitoring the price of the coin so you can decide and sell right away. Compared to holding (long term or even short term), lets not look further, just check how much BTC is 2 years ago and compare to the price today.
Day trading is good option too but most of the cases holding makes the mark. Many people here are different with different mindsets to work in bitcoin. Many have some different objectives and goals that must be followed to earn big profits. Holding helps you to keep your investment safe for long time. Every day when prices start increasing, hold till the best possible time.