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One of the main differences is that fovis_ros supports mono+depth input as well as stereo and viso2_ros supports mono and stereo (but no mono+depth). If you use just a kinect, you will likely get better results using fovis_ros as with viso2_ros you can only use the mono_odometer which has several drawbacks (needs features on the floor and needs to know pitch and height of camera). If you use a stereo camera you can try both algorithms and look which works best for you.
fovis_ros offers a little more introspection which eases the tuning of parameters (compare FovisInfo to VisoInfo). It also has keyframe selection built in. For viso2_ros we hacked a solution to prevent drift on top of the library which is not very well tested.
Long story short: If you have a kinect, use fovis_ros. If you have a stereo camera, try both and look what works best for you. If you have a mono camera, use viso2_ros.
Hope that helps!
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