Which engineering majors are easiest to switch into?

I’m applying for freshman admission and would like to know which engineering majors are easiest to switch into. I’m not sure what I want to do but am leaning toward Mech E. and EE/CS. I’m surprised that I have to lock into such a specific major before I even start college. My though was to select a more competitive major and then switch to the less competitive one if I decide to change down the road once I’m at the school.

Thanks for the insights!