But is there any difference between taking this course online or attend a class?

Live-online deliveries of our instructor-led courses have the same content as do in-person deliveries. The primary advantage of live-online classes is that they do not require travel; the primary advantage of in-person classes is that they provide a structured time that's shielded from work-related or personal interruptions. Another reason why people like open-enrollment deliveries in particular is that they give opportunities to meet other VMware customers and compare notes about experiences. (Although students do interact with one another during live-online deliveries, sometimes there's no substitute for having lunch with people!)

already i have got 3 years Hands-on Experiance with Virtualization specially ESX Server.

If you have substantial experience with ESX and VirtualCenter already, you might wish to consider the next course in the sequence, which is called VMware Infrastructure 3: Deploy, Secure, and Analyze. This course also satisfies the course requirement for VCP, is also available live-online, and can also be paid for using PSO Credits. However, the course is not specifically keyed to the contents of the VCP examination. So if you are primarily looking for a course that will help you prepare for the examination, VI3: I&C would be the better choice.