depends on what kind of loss u have....
If your temples have receded to anything worse than a Norwood 1.5 , then its going to be glaringly apparent, because you cannot use the hair above the bald temples to cover them as you can when the hair is longer. What buzzing does help hide is slight diffuse thinning on top , say DA 1 - 1.5
(DA = diffuse alopecia , DA0 = No thinning, DA1 = Slight thinning, visible only under bright lights or with wet hair, DA2 = Moderate thinning, visible under normal lights but still adequate , DA3 = Marked thinning, coverage no longer adequate even with dry hair under normal lighting , DA4 = no appreciable amount of hair remaining, equivalent to the regular NW6 or NW7) If you are worse than a DA2 , however, buzzing will not really be able to hide the thinning, even when the sides are shorter than the top. You NEED a certain minimum amount of non-miniaturized hair to be able to camouflage the thinning. Also, anything more than very slight crown thinning will also be readily apparent with a buzz.
Its not easy to hide diffuse thinning worse than DA2 w/o using a concealer. So buzzing then just makes one look better, "neater", as opposed to a sickly combover. Its like, "OK, I know that I'm thinning, and I'm not going to hide it".
Cheers,
Arjun