PS1, it was the first real system I owned and my first experience with 3D graphics.
PS2, it had a fantasic line up of games which im still collecting for and God of war 1 and 2 and Killzone 1 was awsome.
PS3, Killzone 2 and 3 had me from the start, I still cant stop playing Uncharted and God of war 3, and theres a mass of great titles 2 hit the system in 2013.
As for handhelds ive got a PSP 3002 and a Vita and the original GameBoy there great systems but I need more time 2 play on them as im more into my PS3 and PS2 but more Vita time is on the cards for 2013, as for my Gameboy I had the Legend of Zelda links awakening it 2 this day is still amazing :)
Check out my Youtube channel : http://www.youtube.com/user/ThePSXcollector