Mega Drive, PS2, PS1 in that order.
Streets of Rage is a game I even downloaded on my phone recently. Elite game.
But PS1 and PS2 was my childhood. PES, MGS, Rayman, Spyro, Crash Bandicoot, WWF Attitude, SmackDown, GTA III, VC and San Andreas.
Those are just some of the games that I grew up on.