Guided vs. Self-Capture: Pros and Cons for Customer Testimonial Videos

For those who capture customer testimonial videos remotely: What are the pros and cons of guided video capture (me asking the questions live, asking the customer to say it one more time, etc.) vs. the customer capturing their own video with prompts? Is it hard to get customers to stop and do this on their own? If I'm creating a written version at the same time, then one call to knock out both seems best.