Automobile Engineering in ME
The main feature of Macpherson strut suspension is that

The unsprung mass in lighter
The assembly is slightly more complicated in design
The vertical size of the suspension can be made more compact
Non vertical external forces are supported by the suspension arms

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Automobile Engineering in ME
The rigid suspension is beneficial when

Large changes in load make it necessary to have a large suspension stroke
It is desired to have more flexibility in design
It is desired to reduce the unsprung mass
It is desired to improve tyre to ground contact characteristics

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