I personally believe in long term as trading is extremly difficulty to predict the prices. You often just read about those who won and not those who lost. And these who won often having very strange explainations why they believe, it was working out nice.

Additionally it comes that in some regions (e.g. Germany) there is an additional very high tax on top if you're trading and not holding for at least one year. Adding the tax with the additional trade fees, makes holding in a bullish market IMHO a way better option for. Ah and don't forget the opportunity costs of the time you put into ;)