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I will quote an answer which I found on Stackoverflow belonging to that question i found as i stood before that decision myself:
Libfreenect is mainly a driver which exposes the Kinect device's features: - depth stream - IR stream - color(RGB) stream - motor control - LED control - accelerometer
If does not provide any advanced processing features like scene segmentation, skeleton tracking, etc.
On the other hand, OpenNI allows generic access to Kinect's feature (mainly the image streams), but also provides rich processing features such as: - scene segmentation - skeleton tracking - hand detection and tracking - gesture recognition - user interface elements etc. but no low level controls to device features like motor/LED/accelerometer.
As opposed to libfreenect which AFAIK works only with the Kinect sensor, OpenNI works with Kinect but with other sensors as well like Asus Xtion Pro, Carmine, etc.
I am using freenect at the moment with success and haven't tried out out OpenNi so long. You can find some info on my projects website here (in german) and see what i have done so long with my kinect and ROS. Project is still under development.
On point i struggle at the moment is, that the ros-freenect-stack is just supported until ROS-Indigo and i want to update to Jade or Kinectic soon, if someone could help out here please contact me!
Fabian
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