I understand there is viral load and CD 4 count which one should I

 
Both the parameters are important. Viral load indicates the number of HIV particles that are present in your plasma. CD4 count indicates the number of a type of lymphocyte in your blood. Viral load indicates how efficiently the virus is multiplying in your body. Higher the number, greater the multiplication of the virus. Lower the number, better for the patient. A higher CD4 count indicates a better immune status, while a lower CD4 count could mean that the patient will have to monitored closely. CD4 count however is a variable number. Normal CD4 count may vary greatly from patient to patient, at different times in the same patient, from region to region, and between different races. Both the values may need to be compared with previous values for a particular patient before interpretation.