Different authorities
Three supports and one support belong to the office management of three supports and one support (generally set in the Personnel Bureau), the special post teachers belong to the office management of special posts (generally set in the Education Bureau), and the grassroots public welfare posts belong to the street office management.
Different wages and treatment
Teaching and special post teachers may be relatively high, and the income of grassroots public welfare posts is not high, but the local minimum wage standard will be strictly enforced.
The possibility of adaptation is different.
Special post teachers are more likely to change jobs, and grassroots public welfare posts are not prepared.