You dont need a poll and a poll doesnt settle this. This highly depends on the situation and that's why you and your friend are not agreeing, u both keep mentioning example-situations, which is not how it should go. Generally speaking both being felxiable and adapting and planing ahead and being organized are important skills and the two arent mutually exclusive. Something you need a plan for doesnt usually work well without it and something than need flexibility doesnt work with a plan.