"Given that both E-Books and online courses be used for the sole purpose of learning, which one would you say was a more effective option?"
I don't see this as being "either...or" (it's like asking what's better, a book or a course). An ebook is a resource and an online course is a means of delivery that includes a whole host of possible resources, learning theories, and types of communication (i.e., asynchronous and synchronous communication).
We might ask: 1) What do you prefer, ebooks or physical books? 2) What do you prefer, online, blended, or face-to-face courses?
Heidi says, "...I know my team would not be receptive to e-books as a form of learning".
When I think of ebooks, I think of books found in Google Books, ebrary, etc. where parts or entire books can be accessible via the web. If someone rejects the use of ebooks, I'd be interested in knowing how much of it is a personal preference and how much of it is due to accessibility and know-how of the Internet and technology as a whole. It would be interesting to know Heidi's corporate learning environment, but I would say that if I have limited access to the Internet and/or I do not know much about technology, that's one thing. If I have access to the web, I'm technologically savvy, and I prefer not to use ebooks, that's a different notion.
Would like to hear additional thoughts on the matter.