Among Nintendo, Sony and Micro, what company has brought forth the most innovation in gaming?

Nintendo obviously.

Sony. Eye toy was their best innovative devices (pioneering motion control gaming) as well as new optical drive formats introduced by them. Sega was also in this list but not in OPs list.

Obviously Nintendo.

Nintendo most definitly. Sony and MS have made great contributions, but not as many and ground breaking as Nintendo.

Since the pokemon go craze started a week ago I was patiently waiting for this kind of thread to appear. It took a week, more than I expected. Congratulations!

Nintendo, no contest.

I give a very slight edge to Nintendo ...

The best thing that Nintendo has originally done as far as gaming goes is quality control and motion control so that about wraps it up ...

Nintendo by far.They are the ones that arguably have innovated the most in the industry.Analog Stick, motion controls, and also on the software side.

Nintendo by a wide margin. They were around much earlier and at a time when many of the features and things we now take for granted were created, usually by Nintendo. Things like the analog stick, controller rumble, the d-pad, and so on. Sony and Microsoft have created many new innovations as well, but none that have had as large an impact as Nintendo's creations.