I mostly do direct equity investing using multiple methods - BTFD, momentum, mean revision, value etc to keep things smooth. One thing I have learned is that sticking to one thing is not a good idea. For example, if you were investing using value you'd be hard pressed to find good investing opportunities in this historic bull run. The last run on commodities might have given you some stocks to work with but those returns came a gap of 3-4 years. In the meantime momentum worked like a charm.
From a funds perspective same thing applies. There is no one best fund. Mix and match based on fund manager's style.