Wasn’t sure the best answer until I saw this: “I’m thinking about majoring in Comp Science”. That to me makes AP CS Principles the better choice. You can demonstrate your abilities in something that would be your major.
Note: If AP Computer Science A was offered, that could be better. I’m a parent, so I don’t have firsthand knowledge in this case. But some points made in this thread say AP CS A is better for the CS major than Principles:
But if Principles is all that’s offered, seems the right choice.