Objectivity. Each of you has a reason for why you are rooting for a certain decision's side... so list those reasons out. Just write down the the advantages/dis

Objectivity. Each of you has a reason for why you are rooting for a certain decision's side... so list those reasons out. Just write down the the advantages/disadvantages of each decision (hrs of dev time, complexity, return of the final product, etc), and keep everything objective as possible by numbers if possible. Then do a Side by side comparison, this takes away the subjectivity and emotional aspect of decision making, and ultimately help you make the best decision possible.