The best 90s pop rock is Mr. Jones, popularity be damned.
Best 90s rock song is arguably Something's Always Wrong by Toad the Wet Sprocket
Best harder 90s rock song is arguably Plush by STP(http://www.autoadmit.com/thread.php?thread_id=3803240&forum_id=2#34729167)
Now I'm cracking up.(http://www.autoadmit.com/thread.php?thread_id=3803240&forum_id=2#34729177)