What could be the reason for having a hard time making a decision

Me and Sara had a lot of long discussions regarding upgrading to a larger boat. We could not figure out why we had such trouble making up our minds if we should buy a new boat or not. We wrote down our priorities on a whiteboard and started drawing lines between new boat and our guiding principles. It was during this exercise that it suddenly became very clear to us why we where having back and fort discussions:

The new boat decision actually targeted most of our goals and values, but it violated one of the goals. That’s why we where going in circles.

A decision can normally be a very easy thing, but if it is in conflict with other key goals it gets harder to take a clear decision