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In my last role I had to make a UX decision about the product that will balance functionality for the user without compromising performance. After testing a few options and validating it with internal stakeholders I released the updated UX, but then the CEO (who was a heavy user of the product) was against that change. I saw down with him and explained my reasoning and the process that I took to validate the solution, and gave him the option to try it himself on an early version. Once he saw the big picture he agreed that my solution was the right approach, but asked that next time I will consult with him before releasing changes like this. 

At Auctane, when during the re-architecture presentation I presented that we should be using ElasticSearch for advanced search and reporting features - a Sr. Manager from another team challenged this choice and said that it cannot serve, the company had tried to host and operate in our Data center before and failed - I had this data and presented that facts - I told that ELK cluster can scale horizontally and since this time we would be using AWS managed Elastic Search operations would reduce for our team. By preparing for this meeting and having some prior knowledege did help me answer this question and gain trust by the larger team.