I explored the vuforia SDK for unity while working on unity for one of my AR experience where I had to track the image and got a very good output compared to the image tracking of unity. But I found out that the surface tracking of vuforia was terrible and had a lot of issues with it.

The most liked part about Vuforia is it uses the existing 3D cad files to generate the Augmented reality experience from it. The Vuforia Dashboard is quite easy and user friendly. The Unity SDK of Vuforia works without a hinch for me and is easy for a beginner to start with as there are proper documentation available for it. It is a modern API that uses 80 % of smaller dataset and provides better output in differernt lightning conditions. It provides better and improved tracking on a moving objects.

Its surface detection for not much proper and stable as many of the times it doesn't works if the lighting conditions are not proper on surface. Its still under development phase so there is no proper solution available for thais issues from quite few time.