While the average passenger might not notice many major differences between the two, the MAX is a major improvement over the 737-800 especially in terms of overall efficiency and range, and passengers can expect to continue seeing more MAX aircraft over the coming years as Boeing continues to fill its backlog of orders ...
After manufacturing issues led to two incidents in 2019, the Boeing 737 MAX was grounded across the world. In 2021, after rigorous testing, Civil Aviation Authorities in many places in the world cleared the Boeing 737 MAX to fly again, including the US, Canada, the UK, Australia, Brazil, and the EU.
737-800. The Boeing 737-800 is a stretched version of the 737-700. It replaced the 737-400 and competes primarily with the Airbus A320. The 737-800 seats 162 passengers in a two-class layout or 189 passengers in a one-class layout.