I had a K6-2 450 on a Soyo 5EMA+ v1.0 with 128MB of RAM, the OS was Win98SE.
It was good for almost any task, running quickly, but it has some compatibility problems... Intel CPUs will be always better in the compatibility/stability department, maybe not in the speed one...
I'm on a 750MHz Thunderbird on an A7V and WinXP Pro now, and the next rig will surely be an Intel, I'm tired with the compatibility/stability issues my current rig has!
No matter what you think, Intel CPUs rules, because speed is nothing when you don't have the control over it!