Jiggy37 said:NSMB:
-Has been out a year and a half longer
-Is on a system with a bigger install base
-Costs less to buy
-Is 2D, which generally makes for tighter platforming (no issues with judging depth, etc.)
-Has a title that blatantly harkens back to the original Super Mario Bros., which to Japan (and everywhere, really) is of legendary stature
-Is a portable title, which means that relatives/spouses/etc. might own one copy each instead of having one disc to a family
And most importantly, of course, NSMB's Fire Flower grants a powerup that lasts until you get hit, rather than that time-limited stuff in SMG.
SMG is still the better game though