I've only had natural, but in my (inexperienced!) opinion, a natural labour is "easier" than an induced one. With an induction your body might not be quite ready to start the labour process so things might not be as loosened up and it all happens so much faster with syntocin being fed into you, rather than your own hormones producing it and making things happen.

Having said that, every birth is different, so it's probably a bit hard to say!