Simply put, are you able to learn whenever, wherever, and however you like? Are the course materials available on all devices? Can you start a module and take the first 15 minutes, then move on to the next one (or is it self-paced?
Some people learn best in a traditional classroom setting. Others prefer to learn online using videos and other digital content. The course you prefer is up to you.
Other than the general factors mentioned above, there are many other factors that can be considered when looking at Human Resource Management courses. These are directly related to the management portion of the course. This is what differentiates an HR management course form a general HR training course.