Here's a little info on each of the candidates, more can be found via Google.
Socrates Educational Video System: I own this, so I voted for it. An ancient (1982) educational toy with an infrared keyboard that had built-in game pads. Mostly used in children's hospitals and the like.
Master Painter and Video Painter These were basically computer paint programs contained in a drawing tablet that plugged into your TV.
Creativision: This was a 1981 computer/game console hybrid, basically the same as a VTech Laser 500 computer.
VSmile: This is a modern (2000s) offering from VTech, a 2D cart based educational system with games that look astonishingly like Macromedia Flash games.
VFlash: A 3D CD-based educational system that looks like a low-end PS1.