Sometimes guitarist to focus on Playing solo. The result is that the Rhythm (Comping) become a second grade technique.
We can also "show off" when doing Comping and one of the best way is to learn many shape of scale (Chord Inversion).
Below I give you some very useful idea. Learn and feel the different. I use A Chord with open string. We call this Open Chord.
Major Shape
Minor Shape
Dominant Chord
More Chord to come, just stay tune :)