Budgeting considerations can be another hurdle. These are just a few of the questions that may crop up about money. You need to address this usage issue before you begin to look at products. It will narrow the field of potential products and make your job easier. People who use synchronous tools will have varying requirements, depending on whether they're using them for communication or training purposes.
Some tools do one or the other well, and some tools do both adequately.
You need to know the features required before you begin the evaluation process. If so, then the ability to record the synchronous session and allow users to view it asynchronously will be a key buying feature. Identifying required training. They require a tight agenda and careful attention to staying on topic. If someone doesn't have information to give or get from attending a virtual meeting, don't invite them.