Raisins are dried grapes, which means they have a higher concentration of sugar and therefore more calories compared to fresh grapes. Additionally, raisins are denser and take up less space, so a cup of raisins contains more grapes than a cup of fresh grapes. On the other hand, a Snickers bar is a candy bar that typically contains chocolate, nougat, caramel, and peanuts. While it is high in calories, it is likely to have fewer calories compared to a cup of raisins due to its smaller size and lower sugar content.