In my experience, it really doesn't matter. Get memory from a well-known manufacturer that meets the specs your computer can use. Personally, I've used G.Skill in several computers and like it. You can find good prices on it and customer support seems to be good.
Most people claim certain brands of memory suck because they got one dead stick of RAM at some point and get pissed off about it. Dead RAM is not an uncommon thing and manufacturers will replace it.