You also can't predict someone actually saving/investing the difference which is why these comparisons are all ridiculous.On a Spreadsheet, SUL for sure is the best play. In real life, it is a toss up as we cannot predict the future or the clients decisions/circumstances that will be made 20-40 years down the road
Create plans for clients using products that address their needs and goals. Leading with product (as these comparisons do) is a fool's approach.