I did them both a number of years ago. I found the ASA nav test to be more challenging than the CG exam given by the License school I attended. I had a former Royal Navy Navigator in my class who I learned as much from as I did my instructor ( who was excellent) .
With regard to CG course and the other material covered, I suppose alot depends on the instructor. My CG license instructor was a 20 year CG officer, with a wealth of knowledge and experience and good instructional skills.
The class I was in was fairly large ( at least 20 ) with a pretty diverse group of mariners. It made for some lively discussions and exchanges of information. I would not have traded it for an online course.
I'm guessing that it's more the instructors than you. It sounds like I was lucky.