I don't know what RAM you are trying to compare because both of your links are faulty and the keywords after each don't work in newegg.
I will say that $30 is low for a new 8GB RAM kit. If there is such a price for an 8GB RAM kit then it is probably used and should be avoided like the plague. $30 is slightly too much to pay for only 4GB of RAM. For RAM 4GB should be about $25, 8GB should be around $45, and 16GB should be around $90.
Unless you do huge amounts of compression or rendering I strongly suggest getting 1333MHz or 1600MHz RAM, of which any set should be very close to the prices I gave you.