Gray's anatomy is one of the best books in Anatomy by so far. But it is expensive. The diagrams, illustrations and quality of paper cannot be missed. If you are fine with buying an expensive book, then you should go the hard copy of Gray's Anatomy and then go for soft copy of Chaurasia. This is because Chaurasia's Anatomy has simple usage of English and if you want to refer something immediately, Chaurasia will be helpful more than Gray's anatomy. Its easily understood. Gray's Anatomy has complex structure of English and you will need time to understand each sentence and so Gray's should be a hard copy.