One of the big benefits of online training compared to classroom training is the flexibility with scheduling. In addition, when learners go through the training on their own, it is at their pace.  For some who already are familiar with the topic, the training will go quickly while for others unfamiliar with the subject matter, they can go through the training at a slower pace.
When you train as a group, inevitably the schedule doesn't work for someone or a participant can't make it because of an illness.
But, there is an upside to learning as a group and that is group collaboration.  Rich discussions on how the training applies in their specific workplace assures learners get the most from the investment of resources.
We think that taking a blended learning approach is the perfect solution.  It combines individual online learning followed by a group workshop to discuss how the training can be transferred to the job.