Nintendo definitely. They saved the gaming industry, started the handheld industry. Brought a bevy of different genres into fruition, and created the most popular video game character of all time. All this while making some incredible games.
That being said, Sony deserves ALOT of credit. Dual analog, discs, media on consoles, and making one of the greatest consoles of all time in the PS2 by bringing together some of the best developers in the industry.
Microsoft is still new, but they did push online to where it is today. Kudos on that, without microsoft, online would suck.
Sega did some stuff, but I don't know much about them.







