What is your opinion? Long term Bitcoin holding or short term trading which should be chosen.
Choose that which you like, or prefer and works best for you - this is perhaps the shortest answer to give to such a question, people like and treat things differently, some would prefer short term trades due to their financial needs, because their urgent need for money won't allow them the time to invest in bitcoin and wait a long time before reaping the benefits, so they prefer to trade it for some profit in the short term.
While others who are more financially inclined, OK, don't mind investing and allowing it for the long term.
So, In all and like I've said before, it's a choice everyone makes for themselves by them self.
But for someone like me, I will prefer both, that is invest part of my funds in bitcoin and keep for the long term, while also buying and selling bitcoin for profit in the short term.