I wouldn't say Sony have a better variety than Nintendo, this is off the top of my head by Nintendo:
2d Platformer:
New Super Mario Bros DS and Wii
Super Princess Peach
3d Platformer:
Super Mario Galaxy 1 and 2
Chibi Robo
Action:
Disaster Doc
Metroid Other M
Action-Adventure:
Zelda PH and ST
First Person Shooter/Adventure:
Metroid Prime 3 and Hunters
3d Tank Shooter
RPGs:
Xenoblade
Soma Bringer
Super Paper Mario
Mario & Luigi PiT and BIS
Magical Starsign
S-RPGs:
Fire Emblem: RD
Strategy:
Advance Wars DC and DS
Dragon Quest Wars
Puzzle:
Art Style
Tetris DS
Mario vs Donkey Kong
Planet Puzzle League
Kappa Trail
Party:
Mario Party 8 and DS
Wii Party
WarioWare
Shooter:
Link's Crossbow Training
Eco Shooter 530
Arcade Racer:
Mario Kart DS and Wii
Excitetruck/bots/bike
Sports/Fitness/Learning:
Wii Sports and Resort
Nintendo Touch Golf
Eyeshield
Wii Fit and Plus
Walking Trainer
Big Brain Acadamy
Brain/Maths/English Training
2d Fighter:
Super Smash Bros Brawl
Flying:
Jet Impulse
Starfox Command
Music:
Jam with the Band/Daigasso
Wii Music
Life Sim:
Tomodachi Collection
Animal Crossing WW and TGttC
Reading/Recipe:
Cooking Guide
100 Classic Books
