Insofar as practicable and consistent with the best interest of the recipients, the provisions of this chapter shall be administered as a separate program which provides the aged, blind or disabled persons who qualify under the provisions of Chapter 3 (commencing with Section 12000) or Chapter 5 (commencing with Section 13000) of this part with a unified and comprehensive program of care. In developing administrative plans to implement the provisions of this chapter, priority shall be given to the plan utilizing the most favorable federal cost-sharing formula.