What kind of immigration system is the best

The best immigration system is a skills based system. One which does not have a fixed quota of immigrant allowance per year. The quota should vary based on the job market for skills in which the country is facing shortage. Students who come in to study in the country can be given preference but again dependent on the requirements of the job market. Immediate family immigration should be allowed. All processing should be done in a timely manner. Once the labor market is saturated make it extremely difficult to work in an undocumented status. Give options for undocumented immigrants to become legal based on their ties to the country and good conduct. Once people know that they have options to immigrate legally in both high and low skilled jobs, new illegal crossings will reduce.