Advantages and disadvantages of installation methods

Advantages and disadvantages of installation methods

What are the advantages and disadvantages of the following installation methods ?

(1)Direct Installation “Cold Turkey”
(2)Parallel Installation (Old system runs with the new)
(3)Single Location “Pilot Approach”
(4)Phases Installation “staged Incremental”

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Which installation do you think is the best one from a project manager perspective? Defend your selection.