I worked with MS products for many years so i know to never buy MS products, so that leave Nintendo and Sony, nintendo has some of the best games I think, but let me show you what it means for me to have a nintendo console:
Surely:
Mario,
Yoshy,
Donkey Kong,
Zelda
Maybe:
Metroid,
F-Zero
Unlikely:
Pokemon,
Dragon Quest
Never:
Batman Arkham,
Elder Scrolls,
Grand Thef Auto,
Grand Turismo,
Mass Effect,
Red Dead Redemtion,
Assasins Creed,
Uncharted,
Tomb Raider,
Need For Speed,
Call Of Duty,
Battle Field,
Dragon Age,
Minecraft,
Borderlands,
metal Gear Solid,
Fifa,
NFL,
PES,
MLB the show,
Farcray,
Dark/Demons Souls
South Park,
Dragon Ball,
Naruto,
Street fighter,
King Of fighter,
Tekken,
Mortal Kombat,
Marvel Vs Capcom,
Dead Rasing
Persona,
Final Fantasy,
Kindom Hearts,
Fallout,
Bioshock,
F1,
Dead Space,
Ninja Gaiden,
NHL
So, I prefer Sony console because the Never list is too big on nintendo.