There is a difference between manufacturers of memory, yes, but not with the branding of it. I've said it before, to much criticism: Crucial memory is often overpriced, considering what it is. The point is, Crucial (as with any other really respectable memory dealer) uses Samsung or Micron original memory. These types of memory carry lifetime warranties, and in my experience, almost never fail.
My point is, there is no real need to just follow the flock, and go to Crucial for overpriced memory, when the exact same thing (quite literally) can be obtained from a number of merchants. I usually suggest going to your nearest small computer merchant, and asking him to price out some Samsung or Micron original of the appropriate type. They can usually get you a good price, and you won't have to pay for shipping.