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The fastest, safest and economical way to do things is pre-assembling on the ground the most elements as possible. That is only the case when you can get and install - because the ground has the capacity to bear the weight - a lifting equipment according to the distances and weights.
Quality control is easier at ground level, and you also improve job quality making your people work safer. Perhaps the most important feature is that you reduce the time that the personnel have to work many meters above ground, which is obviously unsafer and slower.
Photo: Teatro Argentino de La Plata - Buenos Aires, Argentina. Lifting a pre-assembled steel structure of about 100 metric tons with a 800 metric tons crane.