I think it depends on how you handle it really. I have had four very different birth experiences. The first being induced and the second augmented. They were my hardest (and most complicated) compared to the 2 natural ones. However #3's natural labour hurt a lot more than the induced ones because the labour went really quick (2 hours) and i never got time to focus. They were pretty much on top of each other from the beginning. My recent one was just under 5 hours and my contractions never went less than 7 minutes apart until transition so it was really quite easy. I had long rests between them so they didnt feel as bad and i was able to concentrate on them a lot easier than with #3.

So yes induced labours are usually harder than natural. But natural can be hard too. Concentrate on your breathing (i recommend a calm birth course) and focus on your body and baby and you will do fine.