SNES.

EDIT: 2D Gaming at its finest, many innovative titles, several quality platformers and action adventure titles, best controller for 2D gaming ever, Nintendo of course.

SUPER NINTENDO!

Playstation

Because i was never so excited over a console in my life and i have spent more time on the PS1 then any other console i have ever owned.

SONY FTW !
PS1 baby !

Sony - although the company behaviour is quite arrogant, it still better than MS...

AND the PS3 is definitely better console (from HW perspective and capabilities - like BR) with similar games library (many multi-platform titles, some exclusives on both sides, PS3 exclusives slightly better)

Summary - SONY with PS3 is my choice!!!

SNES, because it was the last Nintendo console who dominated before the PS brand.

SNES, hands down!!!!!!!!!!!!!!!!!!!!! Other consoles copy the controller design to this day today.

Wow, this is a tough one. For me its between PS1 and SNES....

I think PS1 just about takes it thanks to its amazing library. MGS1 and FFVII were amazing and the PS1 introduced a lot of other top franchises to gaming (Resident Evil, Tomb Raider, Silent Hill). Super Mario World still has a place in my heart though :P.

But PS1 just about takes it.

PlayStation

PlayStation

It took the market by storm for over 11 years.
Made gaming mainstream
It started a bunch of the most popular franchises ever (Res Evil, MGS, Tekken, Crash, Gran Turismo, Tomb Raider, Tony Hawk, Medal of Honor, Silent Hill)
It helped JRPG games become huge (mainly due to FF7)
It had Suikoden 2