Have you visited Amherst College? It’s not within walking distance of the other colleges. Amherst College is really in a more rural area than Bowdoin. Their towns are very different as well.
Weather is just about the same in both places.
We know grads of both colleges and they loved their experiences.
You need to decide what will work best for you. Is there some reason you are applying ED to one…when you could apply RD to both?