Is Frontier Airline Or Spirit Airline Better? Pricing, luggage fees, in-flight amenities, customer service, and overall value are all broken down in this thorough comparison to help you make your choice. Whether price, comfort, or convenience are your top priorities, we compare the two airlines to find the ultra-low-cost carrier with the greatest deal. Find the airline that best suits your needs and how to make the most of your trip without going over budget.