i personally have never had experience with a western digital. However, i've had a few encounters with the maxtor and i give it an A+. I am a total maxtor fan, especially for their durability and long life. Also, you might as well get the maxtor with the ata133... it opens up upgrade options for later on when u want a new controller/motherboard. However, i can't really say not to get the western digital because i've never worked with it before.