This isn't a pretty easy answer if you're only asking who is the biggest 'gaming' brand. Sony hands down. Sure Nintendo has some of the light, but if we are talking overall mass appeal, Playstation has always dominated. PS1 dominated, PS2 dominated, PS3 held it's own and now the PS4 is absolutely destroying everyone in sight. Also, in the United States PlayStation was ALWAYS the bigger brand over X Box until the 360 had it's moment in the sun, and now most everyone is back to PlayStation. People play what's best, and last gen 360 had most of the better multi plats early on and a year head start, they captured the majority of the US market but even with a year head start they were outsold worldwide in the end. Playstation will own this gen, even in the United States, and that's not really surprising at all. It's the way it's always been the last few gens other than the flash in the pan that was the X Box 360.
*oh and obviously I'm talking about the most recent gens, 1996-Present (ish). *
