I think a couple people made great points, it depends when you grew up and what you like. I went to high school in the mid to late 90's and my favorite bands then were Offspring and Led Zeppelin.
One thing hasn't changed, I still love Offspring and their last album was great, not much air play but some really great songs.
Now I would toss up 90's and 00's. For those of us that have satellite radio, I have Lithium XM 54 on all the time (although they play way too much Pearl Jam).
I also listen to 96.5 the Buzz when I'm in KC and they threw together a Decade Playlist from the 00's. Some really good stuff. Killers, Green Day, Weezer, Franz Ferdinand, Sum 41, AFI, Chevelle, Arcade Fire... To name a few.
And if you're like me and like hard rock. We had a pretty good run over the last decade with Avenged Sevenfold, Papa Roach, Breaking Benjamin, Three Days Grace, Stone Sour...
I'm going with 00's...