Hi karan1988,
There are plenty of options when it comes to preparing for the GMAT besides taking a live class. Is there any particularly reason why you're limiting yourself to just these 2 options? Most GMAT companies offer some type of free resources (practice problems, Trial Accounts, videos, etc.), so that you can "test out" a product before you buy it. I suggest that you take advantage of all of them, then choose the one that best matches your personality, timeline and budget.
1) When are you planning to take the GMAT?
2) What is your score goal?
3) When are you planning to apply to Business School?
GMAT assassins aren't born, they're made,
Rich