When it comes down to the Super Mario Bros series both Super Mario Bros 3 and Super Mario World were considered to be classics.  While Super Mario Bros 3 is considered to be one of the best selling titles for the NES Super Mario World is considered to be top SNES titles of all time.  The map feature that allowed players to travel to different levels was introduced in Super Mario Bros 3.  

But the world got to witness the introduction of Yoshi in addition to new villains and gameplay mechanics which made Super Mario World an unforgettable gaming experience.  Also, both games were so popular that a television series and a musical comedy television series were made based of the success of each title shortly after they were released.  Its really hard to choose between Super Mario Bros 3 and Super Mario World in terms which game is better overall because they were both considered to be gems for the NES and the SNES consoles during the late 80’s and the early 90’s.