The Live Video Streaming service only allows you to broadcast live any event or pre-recorded content that you want to broadcast over the Internet through your website, this will force you to have your PC on.
Your viewers will be able to enjoy your service as long as you broadcast live.
With regard to the Streaming Video TV Station, it allows you to enjoy all the features of Live Video Streaming, but in addition you can continue to broadcast multimedia content without the need for your PC to be on or to be performing a live event, since its service has included AUTO DJ and playlists, where you program what content you want to leave and at what time.