I think their point is that you probably can't compare these two numbers very well because they measure different things, and in the case of Amazon if on average they have 3-4 packages per delivery then the two companies would have very similar numbers. Sidenote, I hate "cant compare apples to oranges" because you eminently can. I'd argue it is much easier to compare things that are very similar! Apples and oranges both have sugars and acids, skins, are recognized as fruits, and are frequently interchangeable. Comparing apples to cranes is much more difficult. "comparing apples to oranges" should mean the comparison is relatively easy to make on a variety of axes!