The barton will be faster because of the cache, though only in some applications, though all of 911's comments will still hold true. Frankly, I have my Barton at about 2280mhz, which is roughly the same speed as a 3200+ which hasn't even been released yet, and it's as stable as stable can be.
XP 2500+ Barton @ 198x11.5@1.85v
Thermalright SLK-800
Thermaltake Smartfan II
A7N8X Dlx
2x512MB Corsair PC3200
BBA 9700 Pro AIW
2x80GB 7200RPM Maxtor
Soundstorm