Ecruz, Glad it helped. FWIW, and perhaps its just me, but I find the pink noise in the Stereophile disc to be more constant and easier to track. The tone on the Rives disc did not seem as constant and it also seemed more beamy, especially in the higher frequencies. But, then, maybe I've just got unsteady hands and one needs to hold the SPL meter steady, like on a tripod (actually I did just that) when using the Rives disc. Anyway, what ever works best for you. The're cheap anyway, waste a acouple of bucks and see for yourself which you prefer. :-)
Oh, the other thing I liked about the Stereophile disc was the assending order of the frequencies. Makes a bit more sense to my poor brain, and I also like that they have a 1k hz reference tone at the beginning so you don't have to mush arouand in the disc to find one.