The modular ones are way easier to replace, removing the
transmission is extremely easy. It just lifts up verticaly
once you get those 4 bolts out disconnecting the starter plate
from the modular clutch assembly. The advantage to a
non-modular setup is a little less rotating mass because the
starter teeth are on the flywheel instead of dealing with a
seperate starter plate. Although, removing/installing the
transmission around a non-modular clutch really blows, I have
done it too many times and I never look forward to doing it
unless the engine/transmission are already out of the car.