Don't do web-learning because you think it is cheaper!
True, with a classroom model, there is the cost of employees' hours in going to a class while web-learning can be done on their own time. But web-learning is frequently not cheap.
Which is cheaper? A stage play with live actors, or a movie?
Only do web-learning if you agree that it suits your employees' busy lifestyle where you can feed mini-lessons here and there.