The people.
I choose roles based on who I will learn from, collaborate with, and interact with. The people at the C-Suite/executive level and the people on your immediate team have a lot of impact on what you want to achieve and how you go about your role. Then the people outside of your team influences how you and your role are perceived. Overall, people make up the culture, impact your emotional/mental/physical well-being, and determine whether you enjoy spending most of your time with them.