Pros: ClickFunnels has a broader scope compared to LeadPages (which is brilliant for lead generation) and it's easier to add upsells and downsells. One of the best things about ClickFunnels is that you can navigate it and create sales funnels with no coding required - no need for HTML, CSS or technical savvy knowledge. THere's a multitude of free templates and paid templates for a professional design even if you don't have any design skills; the drag-and-drop editor stands out.
Prospecting and marketing are all the things you do to get people into the first of your sales funnel stages. Note that stages are broken into two or more steps wherever possible. A demo could be called a single stage, but in real life it involves a lot of things: contacting the customer, sending reminders, doing the demo, and then following up. Whatever your own sales stages look like, the support you need in managing them will be the same.