Both are equally good. Manoharan is more exam oriented whereas Singhania is very detailed and requires time and patience. So depending on how much time you have, you can make your choice. But yes, in terms of absolute concept clarity, I would rate Singhania slightly higher than Manoharan. As I said, its the time and patience factors that should guide your decision.
I think you should refer TN Manoharan for exams as you also need time to focus on other big subjects, specially CAFM.
TN Manoharan is completely exam oriented and can be completed easily.
But VKS is very huge and you need lots of guts to do this book at least once.
But personally speaking I refered VKS and in exam I saw none of IT que. which was not covered in the book.
I think you should refer TN Manoharan for exams as you also need time to focus on other big subjects, specially CAFM.
TN Manoharan is completely exam oriented and can be completed easily.
But VKS is very huge and you need lots of guts to do this book at least once.
But personally speaking I refered VKS and in exam I saw none of IT que. which was not covered in the book.