Hi Pranav94,
Since you posted this in another Forum on this site, I've pasted over my response from there:
Although I cannot offer a side-by-side comparison of the two sets of books, the consensus is that there isn't much of a difference between recent consecutive editions of those books. Thus, you would likely find either set of books to be equally helpful. Unfortunately, it's difficult to define how quickly you could work through any type of practice materials - the time it takes you to read (and potential re-read), comprehend, do the associated practice, etc. is heavily influenced by your skills, strengths and weaknesses.
Since it sounds like you're just beginning your studies, then it would be a good idea to take a FULL-LENGTH practice CAT Test; you can download 2 for free from
www.mba.com (and they come with some additional practice materials). If you want to do a little studying first, so that you can familiarize yourself with the basic content and question types, then that's okay - but you shouldn't wait too long to take that initial CAT. That score will give us a good sense of your natural strengths and weaknesses and will help provide a basis for comparison as you continue to study. A FULL CAT takes about 4 hours to complete, so make sure that you've set aside enough time to take it in one sitting. Once you have those scores, you should report back here and we can talk through your study plan.
GMAT assassins aren't born, they're made,
Rich