Just the feeling:
Double brie was a normal, tasty brie. Triple cream brie was so deliciously creamy it didn't just live up to its name, it made me stop and reconsider how much I take notice of all names, of all things. Powerful. Important. I probably can't go back to regular brie now.
Just the facts:
Total energy: higher in triple.
Protein: higher in double.
Total fat: higher in triple.
Ingredients: same except that triple has cream and the milk in double is pasteurized.