Does glucose give us more energy than starch My question is not which will give energy faster or which is more easily absorbed by the body but rather Which of the two is more energy dense?

If you are referring to energy dense, then it definitely is starch, as it is a large molecule and more complex than glucose, the simplest sugar that is readily absorbed by the body as it can diffuse through epithileal cell walls and into the cell/bloodstream. Starch is more complex...you can tell by this:

Starch--(broken down by amylase)--->Maltose----(Broken down by Maltase)--->Glucose

It is like a building block, Glucose chemically combine to form a more complex sugar, then starch. That is why chemical digestion requiring the biochemical catalyst amylase to break the larger molecule into a smaller one.

Glucose is a simple sugar, and you can say it is like a building block for Starch.

It is like asking, which has more metal atoms, a scrap of metal or a car.

The car, being made up of scraps of metal, has more metal atoms, like starch is more energy dense as it is 'made up' of glucose.

You can say starch is 'made up' of glucose as when digestion takes place, starch is broken down into glucose by the enzyme amylase.