Honestly if I could mix a match elements could have the ultimate generation as each had issues along the way.
That said
1. 4th
2. 6th
3. 7th
4. 3rd
5. 5th
6. 2nd*
7. 1st**
The SNES and Genesis were two great systems that delivered so many classics. Maybe I was the perfect age, but I still play various 16 bit classics to this day.
* I barely remember this generation, but I have no desire to play games from then unlike 3rd and 4th.
** I never played games from this era so bit unfair for me to comment on it.