Inspiration or Data
Inspiration: am I in touch?
Some methods require personal involvement and creativity, These methods aim at feeding your intuition and own, subjective, take on things. Such inspiration oriented methods exist for all strategies.
Data: what are the facts?
Some methods favor a detached approach focusing on the facts only. They aim at getting an objective and rational take on things. Anyone repeating your research should get the same results. Such data-oriented methods exist for all strategies.