Even im confused with the same question as im accustomed with Manoharan since IPCC and now every one is suggesting VG's modules.
I have no idea how Manoharan's book is since it is still not out in market. I have checked on VG and i think it fits to the standards and easy to understand
Vinod Gupta's Book is interesting and analysis of section is given in an apropriate manner.... even past questions are solved after every chapter..... I have been reading this book since 15 day and it is goood