The correct answer is to talk through how you'd evaluate making the decision based on the requirements and measured usage patterns, talk about what you've used in the past and why, if you haven't really been in a position to decide this or think about it, don't lie or randomly pick a number but just get out whatever you do know about it. So kind of like just talking through your second paragraph and maybe creating a hypothetical situation and answering based off of it.
Yeah, that makes sense. I feel like I can talk my way out of anything, but if there's a correct answer that exists without thinking, I'd love to know it. Not for interviews, but for In Real Life performance ;)
