Hey there, ChrisTsall99!
It really depends on what you are planning to use this drive for, really. The WD Blue is designed for everyday computing and to deliver solid performance. However, keep in mind that the available 7,200 RPM WD Blue drives are only up to 1 TB. All the available capacities above that are with 5,400 RPM. You can see more about its features and capabilities here:
http://products.wdc.com/support/kb.ashx?id=40D1Rc
The WD Black is our performance drive and just like @InvalidError mentioned the 5-year limited warranty definitely gives some peace of mind. That, of course, doesn't mean that you shouldn't always have backups of your data!
These HDDs have 7,200 RPM and they also feature a dual-core processor that offers twice the processing capability in order to maximize the drive performance for faster read/write speeds. Here you can check the product page of the WD Black as well:
http://products.wdc.com/support/kb.ashx?id=cPR8GS
If you have more questions, feel free to keep us posted!
Cheers,
SuperSoph_WD