For me back labor was more painful:/
I've only had back labor so this time I am hoping for stomach. My sister in law said stomach was easier for her.
They are both very painful, but I must say back labor was very horrible for me, my partner had to keep massaging my lower back and keep a heat pack on it. So yeah, if have to say back labor was worse for me.
Never had stomach labor but I can say that for me that back was how the Lord knew I would feel the pain... I have a high tolerance for pain so that was my spot with my first 3...