I have not flown the NG but have the 300 and 500. The problem with the 737 is that it is a common type from the 100 to the 900. They had to keep the old 6 pack warning system and manual switching while the A320 is a much more recent design with a lot of automatic switching and EICAS system. A lot of people prefer Boeings, but I really liked the A320. I also very much enjoyed the 757, 767, and 777. The 737 not so much although the NG does have a modern FMC.