Here is what I know about them.
The Brisbane as 512K cache while the Windsor only has 256K, but the Athlons don't seem to respond much to larger caches. The Windsor at the same clock rate is actually about 1-2% faster than the Brisbane even though it has less cache.
The Brisbane uses newer 65nm die shrink over the Windsor's 90nm, so the Brisbane does run a little cooler and should overclock better, but in the real world, there is not a lot of difference at all in the way these processors perform. It's a toss up really.
In their day these processors were king of the hill, handily outflanking anything offered by Intel (Pentium and Pentium D dual core) but today they are they are painfully slow compared to the new Phenoms. Intel's aging Core 2 Duos are 15-30% faster clock for clock, and the latest round of Sandy Bridge processors simply blow them out of the water, literally.