Why is a specific methodological approach and a method of analysis promising in relation to an overall research purpose and according to a specific research tradition?

Why is a specific methodological approach and a method of analysis promising in relation to an overall research purpose and according to a specific research tradition?
– How can exemplified data (your own collected or secondary) be analysed in detail according to the chosen tradition and why is this more promising than other possible choices?
– How are quality criteria for the chosen study considered including research ethics?