The question of what phone does dual core best seems to finally have an answer for us. Androidandme took two of the newest dual core devices, the Optimus 2X and Atrix4G, out of their comfort zone to benchmark them in comparison with other none dual core devices. The test compared these two on many aspects, most having the Optimus 2X coming out on top but just a few had the Atrix flexing its Moto muscles.
The results below goes to show that specs don’t really define a device, the configuration is just as important.
Source (Motorola ATRIX 4G vs. LG Optimus 2X: Not all dual-cores are created equal | BGR)