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The Ghost of RubangB said:
Difficulty, hardest to easiest:

The Lost Levels
Super Mario Bros. 2
Super Mario Bros. 1
Super Mario Bros. 3
Super Mario World

Length of fastest speedruns, longest to shortest:

Super Mario Bros. 3 (11:01)
Super Mario World (10:59)
Super Mario Bros. 2 (9:15)
The Lost Levels (8:34)
Super Mario Bros. (5:00)

 

Seems the games had a trend of getting longer and easier.  Jam-packed with more content, but not as frustratingly difficult.  If New SMB Wii is harder (thanks to the Super Guide) AND longer than Super Mario World, I wil be very very happy.