The common difference is that Skype and phone interview require you to be “online” and “schedule a call/meeting”.
Skype is dedicated for live conversations.
Vision-CV allows candidates to record their video answers for the questions which you had prepared before. The key point is that you don’t have to be online or schedule a meeting.
You create couple of questions in a text format, send it to all your candidates just in one click. Candidates record their answers at any time and place.