The right rental decision at Denver International Airport depends on where the itinerary goes after pickup, not on a generic -best car- label. Start with the airport transfer, then list passengers, luggage, parking needs, road conditions, and any toll or charging questions.
Denver-only stays can favor a compact or midsize vehicle, while Boulder, Colorado Springs, and mountain itineraries require a deliberate check of weather, traction rules, luggage, and road conditions before choosing a class.
Compare the agency's current vehicle description and terms with the actual route before booking. Treat rates, authorization holds, hours, inventory, and add-on policies as changeable: verify them with the operator and the relevant airport or transportation authority immediately before travel.