Magma is a very good tool .
Reasons >>>>>>>>>
Magma uses the early silicon performance which gives the timing estimation prior to detail p &r .
It can predict in the early design flow whether the design will meet the timing in the final layout or not by early silicon performance.
It uses the super cell approach and gain based synthesis in synthesis to reduce the runtime and give the best size of the cell that will result in best area .
It uses the unified data model for whole the flow to reduce the data conversion between the stages in the design flow this will result in reduced memory usage.