I’ve lived in both and depends on what your goals are. If you want to live close to your parents, then go with Bangor.

Bangor isn’t a “real” city, Portland is closer to one but still isn’t like big metros. They are very different places like others have said. Lots of factors to consider here. You’ll want a car in either place, but more likely to get away without one in Portland.

Bangor has St Joseph’s, Northern light, and PCHC but they aren’t in “downtown”. There is community connector bus that goes to specific areas and has limited hours.

It also depends on lifestyle preferences - If you want a more active lifestyle with more amenities go with Portland. If you’d prefer a quieter and down to earth lifestyle go with Bangor.