Mollyanne, your post prompted me to google the subject. The Washington Post rated Swanson's tops as did one or two other tests. Food & Wine rated College Inn tops, which I don't understand and Swanson's was third.
I had used College Inn for years because my Mom used it. After discussing the topic here many years ago, I did a taste test of my own with College Inn and Swanson's. SO and I both liked Swanson's better.
"If you want to make an apple pie from scratch, you must first create the universe." -Carl Sagan