I think if we save Bitcoin for a long time there is a chance of its fluctuated nature. So if we invest bitcoin instead of saving this will good. If we are risk taking personality we should save it for a long time in wallets. There are so many reasons to save it for a long time if we have huge amount of bitcoin and its price goes up there is a chances of growth in profits.
Long term savings is always advisable for majority as only few are really good into monitoring the price and do the right timing.
Most of us has life outside crypto like we have a day job where we need to bust our asses 8 hours a day and when in trading we need to concentrate.
If you don't want to work for 8 hours everyday then you need to build up a solid protection in financial like your emergency fund and have some insurance after building that then you need to have a capital for trading cryptocurrencies because it will become the possible replacement for your current job because it is possible to earn up to double the amount of your salary.
Day trading on contrast, need much attention to observe the market price daily and at every moment. You have to sit in front of your sofa and see the whole thing going up and down.
Long term is better, as you said well, we have a life mostly out if this business world to better is to take bitcoin one time and then save them until good price come and you sell it.