Here is a performance comparision between the four most popular smartphones in the market, the newly launched iPhone 3GS, iPhone 3G, Palm Pre and the first Android phone T-Mobile G1/HTC Dream. Both the new iPhone 3GS and the Palm Pre are powered by an ARM Cortex A8 processor running at 600MHz. After the break you can see detail results that is done by AnandTech.
The main focus of the comparision is on the webpage rendering speed and application launch speed. In both test, the iPhone 3GS gets the crown.
Web page rendering