I have done both. I have had audi flywheels balanced and fidanza flywheels for that matter.. They always can balance more then audi balanced them. Having all of your internals balanced combined with your flywheel/pressure plate is awesome.. Afterwards, regular oem motors feel like 5hp Briggs motors.
balancing an assembly is cheap. 200 dollars is worth every penny to not have a smooth engine like my URQ's, or other balanced i5s I have been in. I would do it to any motor that plans to rev past 7500, or has a bigger turbo that needs to rev