If you use a lift pump (FASS or AirDog) to the factory fuel pump, then you need a regulator in the system (the factory one is located in the secondary fuel filter housing) and the fixed orifice kit will not work. So, a crossover line is what works.
If the AirDog that you plan on using is an AirDog II; which is regulated to 60 psi or wherever it will be regulated at, then the fixed orifice kit or crossover line will work. FASS recommends using a fixed orifice kit to help extend pump life, but since the AirDog II hasn't been released, I don't know if the AirDog will or will not.
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