The 90s:

- Super Mario World
- The Legend of Zelda: A Link to the Past
- Super Metroid
- Super Mario RPG
- EarthBound
- Super Mario World 2: Yoshi's Island
- Donkey Kong Country 1-2-3
- Super Mario 64
- Goldeneye 007
- The Legend of Zelda: Ocarina of Time
- Star Fox 64.

This list should be self explanatory.

I'd say the 2000s to early 2010s. I didn't grow up with the NES but I did grew up with the SNES, about four after the SNES life cycle ended. While I enjoyed the 64, SNES, and a little of Game Boy, the 2000s to early 2010s were really the time my life as a Nintendo fan was prosperous (and in a way still is). From Melee to Prime, Wind Waker to Twilight Princess, Super Mario Advance to Pokemon Ruby/Fire Red, Pokemon Heart Gold to Y, Galaxy to 3D World, Brawl to Smash 4, Last Story to Fire Emblem Awakening, Animal Crossing to Splatoon, Wii Sports to DKCR, etc. I loved my GameCube, GBA, DS, Wii, 3DS, and even Wii U despite only having it for less than a year. Then you got third parties like Shin Megami Tensei IV, the Ace Attorney series, the Professor Layton series, Time Hallow, TWEWY, the Dragon Quest series, the Monster Hunter series, Red Steel 2, No More Heroes, Bayonetta 1 and 2, Soul Calibur 2, Tatsunoko vs. Capcom, etc.

All in all, while some will put the 90s and 80s over the 00s and 10s, the latter two decades (with the 2010s not even over yet) are nothing to scoff about. A variety of new ways to play, new unique series from different genres, revivals, remakes, and many more.

2000s for me.

I think Nintendo were at their peak of creating amazing games with the SNES and N64.

Not any decade by chance. But 80s until 96, then 2006 until 2011. Especially the Wii, because Nintendo for the first time actually got game distribution right.

The decade between 97 and mid-2006 were somewhat of a dark age. There were constant droughts, and periods with no game releases at all.

The Wii generations.
Prime Trilogy and Other M
Mario Galaxy and 2 and 3D World
Xenoblade and X
Mario Kart 8
Smash Wii U
LoZ Botw and Skyward Sword
Fire Emblem Radiant Dawn, Fates, and Awakening
Luigi's mansion dark moon
Kid Icarus Uprising
Splatoon
Fatal Frame V
Crystal Chronicles Echoes of Time, and Crystal Bearers
Bravely Default and 2
Bayonetta and 2
Wonderful 101
ect, ect, ect. It's been a busy time for me as a gamer.

I'm not sure why you're singling me out, the vast majority of people in this thread are voting 90's and its not because none of us have played N games since then. I've played MP, WW and MG and frankly none come close to touching OOT. Did you play OoT when it released? If you didnt you cant really make a judgement on this. WW stripped down the difficulty substantially, had half the dungeons and none of the impact oot did. MG and MG2 are both exceptional and I'd agree that they go up against most great N releases in history but thats about it. TF does not have the difficulty of DKC 2 or 3 and reuses most of its iconic music while losing the iconic villains. MK8 is great but the original MK blew minds the way no new MK can ever hope to do. 

It's not fair tp put up games like SSB against SSBM and so on. It's not about direct comparison, it's about the fact that Nintendo's major releases in the 90s blew minds. they imprinted themselves in to peoples memories in ways that new Nintendo releases can never hope to do, because they do not define the industry the way seminal releases like Oot or Mario World or the original MK did. I can play MK8 and enjoy it - in fact I would much rather play MK8 than the original MK today. But MK8 cant hold a candle to the impact the original had on me as a game that created a genre out of thin air.

That's just my opinion.  Let's try not to being objectivity into a post about peoples opinions.  For you OoT was pretty good.  I would have prefered OoT to be more of the traditional top down of the past or at least isometric view, same with Majora's Mask.  Again though, just opinions, no right or wrong.

The 1990s get my vote.

SNES + N64 is an unbeatable combo, boasting many of the greatest games ever created, including several that changed the course of gaming history and defined/redefined entire genres.

2010s because the console codinamed Nintendo NX is the most awesome console since sliced bread =)