Amazon is primarily an online shopping platform that offers a wide range of products and services, making it a go-to choice for consumers looking for convenience and variety. In contrast, United Airlines is focused on air travel, providing flight services and travel-related bookings. If you are looking to purchase goods, Amazon is the clear choice, while United Airlines is suitable for booking flights.

Amazon is widely used for its extensive product selection and user-friendly interface, although it has faced criticism as an employer. On the other hand, United Airlines has received negative feedback regarding its website usability and customer service, leading to a frustrating experience for some users. Overall, Amazon tends to provide a more positive user experience compared to United Airlines.

Amazon is widely used for its vast selection of products, competitive prices, and fast delivery options. However, it has faced criticism for its treatment of employees and its impact on small businesses.

Amazon is a global online marketplace that offers a wide range of products, from electronics to groceries. It is known for its user-friendly interface, competitive pricing, and efficient delivery services.

Amazon has been criticized for its work environment, with reports of high pressure, long hours, and demanding productivity targets. However, some employees appreciate the opportunities for career growth and competitive salaries.

Besides online shopping, Amazon offers a variety of services including Amazon Prime for fast shipping and streaming, Amazon Web Services (AWS) for cloud computing, and Amazon Fresh for grocery delivery.

United Airlines is a major American airline headquartered in Chicago, Illinois. It operates a comprehensive domestic and international route network, making it one of the largest airlines in the world. United is a founding member of the Star Alliance, the world's largest airline alliance.

Currently, there are no user-generated pros or cons available for United Airlines. However, general feedback about airlines can vary greatly and may include factors such as the quality of customer service, in-flight amenities, punctuality, and ease of booking.

You can book a flight on United Airlines through their official website, www.united.com. The website allows you to search for flights, compare prices, and complete your booking. You can also book flights via their mobile app or by calling their customer service.

United Airlines offers a variety of services including in-flight entertainment, Wi-Fi, meal options, and different classes of seating such as Economy, Economy Plus, Business, and First Class. They also provide a frequent flyer program called MileagePlus, which allows passengers to earn miles and redeem them for various rewards.