CLED agar is preferred to MacConkey in the processing of urinary samples because :

CLED (Cysteine Lactose Electrolyte Deficient) medium Non-selective medium on which both Gram positive and Gram negative bacteria can grow. MacConkey Mildly selective medium for Gram negative. Most Gram positive is inhibited. CLED agar is hence preferred over MacConkey in the processing of urinary samples. Both media inhibit swarming of Proteus. Since both contain lactose, both are differential media, i.e-LF and NLF can be differentiated.