Think of it this way - if that $150k is going to be a big difference in your parents’ lives, maybe choose the cheaper option. How would you feel forcing them to work an extra 3 years before retirement? Because of FA our instate options were about the same cost as ND.
Just make sure you do super at the state school if you go. I have seen too many highly capable kids, like my oldest, feel they don’t have to work hard and get caught up in the party culture. S1 did turn it around but was nearly kicked out. Others were not so successful.