I'm looking at buying two different cars, both similiar body styles and similar mods.

Price isn't the issue, really. I just don't know enough about these two motors to make a well informed decision.

Lets say they both have the same bolt ons, similiar builds, same size turbos, injectors, etc.

Which one is better? Which one will do more down the road? Which one is more reliable?

Assuming they are both putting out about the same HP, they both claim to be in the mid 500's, what are the pros and cons on each and why?

Thanks in advance.