Conflicting ideas in a business setup

In a business setup, when working with more than one person, it is usually common to have conflicting ideas. Meaning the ideas you bring might be completely different from what the next person might bring. How do you handle such situations?
Do you simply brush the ideas away or do you try to reason things out with them to see which idea is better?

I always try to weigh the two ideas and the one that has more substance is the one I lean towards.