With DS I was induced, but had spontaneous labour with DD.
The contractions with DS were much stronger and very painful. DD's labour was a lot longer and more painful, however, not at the front, but at the back because of her funny head angle. I reckon a normal labour with a normally aligned baby would be a piece of cake
Anyway, I think it all depends, which is totally unhelpful for you I know. I remember wondering the same thing before DD was born though.