I have been to both but only to one WORCS. The WORCS was more wide open flatter track with a mix of motorcross track, wide open straights, sections of weaving grass track, and sections of technicial with small elevation changes, jumps, logs, telephone poles, and rocks. More of a designed layout. The GNCC was more of a fast technical track on natural terrain with lots of big hills, ditches, mud, rocks, weaving single track through trees. The GNCC was closer to a wide open enduro without checkpoints. The GNCC appeared to be much more technicially challenging while the WORCS seemed to be more about speed.