Full Suspension or Hardtail for XCM

I competed in an XC marathon last month on my hardtail. I definitely wish I had a full sus. I was broken at the end and definitely would have been faster if I had full suspension. That said someone else on the same bike finished 10th and that was against current World Tour pros, so I wouldnt say hardtails are slow but need to be in the right hands to be fast.