This is because skilled migrants bring with them high educational qualifications and higher employment potential. This holds the promise of a better contribution to the economy. Migrants who are sponsored by employees have more potential to bring the desired results.
With the Australia Skilled Migration stream having the greatest number of places, this should be your option when applying for permanent residency. You have better chances under this stream, provided you meet the eligibility requirements and score the required points under the Australia points calculator. Moreover, the Skilled migration stream is a points-based system and is the most popular immigration program to get permanent residency.