Which is the MOST Important Factor to an Employee, in Your Opinion ? 1) Job Security 2) Job Satisfaction 3) Salary & benefits 4) Any other

It's not a matter of opinion: there is data on this point.  The thing that is most important to an employee is not the salary, job security, or the salary.  It is the competence of their immediate manager.

The biggest single reason for people resigning from jobs is their immediate manager.

It will always be a job satisfaction because this is what will lead them to job security, salary & benefits and others.

• When Work is a pleasure, Life is a Joy; When Work is a Duty, Life is slavery

• Job Satisfaction is the topmost priority followed by Job Security, Salary & benefits