realistically the difference between those two pulleys is negligible. you should more than likely run a 3.4 and as much timing as you can, but it really depends on how you like your car to run.

i enjoy running my car with low timing and high boost because thats what i enjoy doing. other people like low boost and high timing. out of boost your car should run the same because the timing tables dont change that much, but in boost really depends on how you want your car to run.