I did an online addition qualification course to enable me to teach high school physics. Basically, I sat on the couch for a month-and-a-half and did nothing but research & type. I wrote more for that course than I had for any course in the previous 25 years! All this for either a fail, pass, or honours pass. Being type A I went for the honours pass. Got it. All the while, other people did the minimum for a pass. In the end, the honours pass meant nothing professionally.
Given the choice again, I would sit in a classroom and interact with others. That's the key though - is the course available locally or would you have to drive hellish distances or even relocate.