Difference between WD10EZEX and WD10EZRZ

Could anyone tell about difference between WD10EZEX and WD10EZRZ of WD BLUE in PRACTICE. Which one is better to buy? They have same price. Thank you.

Hello,

According to this link

The only difference between these to model numbers is the RPM.

The WD10EZRZ model is a 5400 RPM and the WD10EZEX is a 7200 RPM drive.