Is the following statement true or false? The singlephase, single-channel model with Poisson arrivals and constant service times will always have smaller (i.e., lower) operating characteristic values...

Is the following statement true or false? The singlephase, single-channel model with Poisson arrivals and constant service times will always have smaller (i.e., lower) operating characteristic values (i.e.,
W,
Wq,
L,
Lq) than the same model with exponentially distributed service times. Explain your answer.