The models shown are generally just examples of what you could get, not necessarily what you would get. With a large company like Enterprise, if you're renting at a major airport, they will typically have numerous vehicles available in the compact SUV class, so if you prefer something other than a Ford EcoSport (which is considered a subcompact SUV by the auto industry), they will generally try to accommodate you. If it's a neighborhood location, choices may be more limited, but again, the EcoSport is just one of many models they typically have in this class, so chances of getting one aren't any higher than any other make/model.

Separately, note that the Ford EcoSport has been discontinued in the US, so expect Enterprise to update the example vehicle model for this class in the near future.