N64 for me. I was a poor teenager then so I probably only ever played about 10 games on it, but what games they were! Mario 64, Ocarina of Time, Majora's Mask, Goldeneye, Banjo-Kazooie...
I'd had a PlayStation first - I saved up my paper round money for about 6 months lol to pay for it - but I was never that taken with it really. I ended up selling it before all the real classics released.
The 00s was really when I was able to start enjoy gaming more tbh. Plenty of money and plenty of time.