Which One is Better? IDS or IPS?

A quite cool passage from one of the SANS' studies:

"Some may argue that an IPS is better than an IDS as it maintains the ability to block completely potentially malicious traffic, which in turn might completely stop attackers in their tracks; however, this is simply not the case. The choice between an IDS or IPS system depends solely on meeting the goals of your organization, without causing unnecessary network connectivity issues for legitimate users on the network."

(Source: https://www.sans.org/reading-room/whitepapers/detection/intrusion-detection-prevention-systems-cheat-sheet-choosing-solution-common-misconfi-36677)