Soler is bolder in both structure and harmony
The problem is that this 'structural' and 'harmonic' boldness isn't the result of a clear artistic aim, he was just trying to stir himself away from his mentor, alas, unsuccessfully. Most of the times he just rambles around without a clear goal until he goes back at imitating Scarlatti. He may have been a talented musician but didn't have the mark of a creative genius.