Mike101,
I've had both OS's on my system for quite a while, but was using 98 for its compatibility with all my hardware. Not until recently did I start using 2000, and it is SO much better! I have 320 MB RAM, and 98 doesn't seem to use very much of it. In 98, my cursor won't move when web pages load (cable modem), but in 2000 I don't have that problem. And, web pages load much faster. Overall it's much smoother and feels much faster.
However, I do have compatibility problems. My Turtle Beach Montego II sound card isn't fully compatible, so I don't have bass/treble controls. My STB Velocity 4400 TNT1 video card doesn't play games well. Madden 2K is noticably jerky - so much so that I play it in 98. I can't get my Kodak 240 to connect via USB, so I load pictures in 98 too.
But, I do those things very rarely, and would rather just take the additional 2 minutes to boot over to 98 when I need to do those. I will be upgrading my sound card soon, and perhaps video too. But for everyday computing (web, office, email), I run 2000.
Rob