One of the primary advantages of using econometrics over typical results from economic theory is that

Econometrics is much more mathematical in nature. In economic theory, only the theoretical part of economic aspect is highlighted but in econometrics, the theory is supported with a mathematical explaination. Econometrics provides a much more deep understanding and explaination of a concept than normal economic theory. it potentially provides you with quantitative answers for a policy problem rather than simply suggesting the direction of the response