Cuddled to sleep or left to fall asleep?

Hi i was just wondering what everyones views were on newborns aned sleeping.

When I had my last child about 6 years ago I cuddled him to sleep everyday and even at nap time. this included singing, rocking etc...

recently I have seen that many of my friends with baby's tend to put them in their crib/cot and leave them to go to sleep.

I was told this might help them not be so clingy but I'm not so sure as my son was not clingy and if I am honest would miss the special singing and cuddling time.

What do you think?