It really isn't harder or put it this way that is not the right question.
Gore is about perfect for most of the "Riverrunner" types for many reasons. It's really not a creek at all, although it does at times have a creeky feel.
You can turn riverrunners quicker into eddies generally (for sure with a Hero) as it has chines and assist in grabing currents. They are generally faster than creekers as well, so when you want to get around on the river a couple strokes in said direction and you get there sooner.
In my opinion, RR's are better in Gore than probably any other style boat. The Hero missed 2nd place at Gorefest (paddled by a non pro regular joe) by like 10/100's of a second or something very close to it....
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body. But rather...To skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming... WOW !!!! What a ride!!!!!!"