I voted SS, DC, SMS, Gen, although it could just have easily been DC, SS, SMS, Gen. I only slightly prefer the SS to the DC, both are f*cking fantastic.
I voted SMS over Genesis because I think that the in the 16-bit days the Genesis was such a far far distant forth for me with the PCE , Neo Geo and SNES being out there. Its an OK machine in itself, but still forth rate, IMO. The 16-bit days were very competitive times. On the other hand the SMS, even with its rather pathetic software library, was still a unique enough, and fun enough experience even if you had a NES that I have to give it some respect.