This question, at times, haunts the decision making leadership without having a structured approach to make such decisions. Gut feelings or subjective opinions can lead to confusion and irrational decision making. There is no better way than quantitative scoring of these two options across multiple criterion. Quantifying values also allows multiple stakeholders to score and averaging the score leads a collective decision.

As a first step, collectively align on the Metrics you would like to evaluate your Build Vs Buy decision. Go beyond achieving feature performance parity and consider metrics like compatibility Speed to Market, Cost/ROI, Training and Support.