which is better? Coke or Pepsi? Personally I prefer coke.
Intel Sandybridge/Ivybridge cores are larger and more complicated than AMD Bulldozer cores. I won't get into specifics but each Intel core is approximately 2.0-2.5 times more powerful than an AMD core per clock.
depends on how you are using the processor. Intels has a better equipped architecture. AMD has quad cores at several price ranges and have cheaper upper end mobos compared to the intel counterpart.