If you are commuting to Clark you’ll be fine. It’s not a war zone. Just the New England version of a rust belt city. No one will bother you at all and Clark is an excellent school.
Waltham is just a bustling mix of corporate headquarters, a small rugged NE city feel and homes.
But the best advice I have seen is around traffic and driving. You will be very unhappy and tired commuting from Wellesley to Worcester. That’s no fun.
Wellesley is perfectly located for Brandeis or Bentley. It’s overall a great area to live.
That being said I would go to UNC in a heartbeat over these options. Not because of the education. I think they all would be terrific for you. Just for the pace of life. College vibe. College town and overall weather.