The core duos are better. I'm not sure by how much. But i believe it would be noticable. Not only that, but i believe that the core two duos can be overclocked a lot higher.
Plus, the core duos are basically two processors crammed together. The core two duos aren't.
you have it totally wrong
the Core 2 Duo is the newest best proccessor from INTEL Core Duo is an old version and not as good
That's relative to a Pentium 4/D. Compared to Core (Yonah) it's more like 15% is the laptop world, the desktop advantage is a little more because of increased bus speed.They are faster and i think have a 40% increase in performance.