The difference is so small you will never notice it. The Black series is a more robust drive with a 5 year warranty vs a 2 year warranty on the Blues. The Black does have some performance features the Blue lacks but the only way to really tell a difference is with benchmarking software. The real consumer difference is the warranty.
If you want a true all around speed boost get an SSD. Even a cheap "low end" SSD is many times faster than any mechanical drive.