Migratory aptitude of chlorobenzene vs nitrobenzene in pinacol-pinacolone

I do know the basic order of migratory aptitude in pinacol-pinacolone rearrangement, which is usually said as subject to reaction conditions.


However, I wanted to know how can I compare the migratory aptitude of chlorobenzene vs nitrobenzene in pinacol-pinacolone rearrangement? What are the factors that we are supposed to check when only the benzene substituent is changed?


