We have a legendary thread like this one for Gwok Jing vs. Yeung Gor, but Gwok Jing vs. the Golden Wheel Monk is also a perennially popular debate (although not as popular as Gwok Jing vs. Yeung Gor, of course) and probably should have its own thread rather than occupy a dozen stray threads spread out across the forum. The topic does seem to come up several times a year anyway.
There was never truly a fair fight between them during ROCH. The closest we came to getting a true measure of their respective abilities was during the single palm clash they exchanged at Luk Family Manor. The information that Jin Yong provided from the result of that exchange was that Gwok Jing had somewhat superior martial arts technique while the Golden Wheel Monk had somewhat superior inner power, resulting in an overall draw. Jin Yong also remarked that it would take at least 1,000 strokes to determine the victor in a fight between Gwok Jing and the Golden Wheel Monk, but didn't really hint at who would emerge as the winner in such a fight.
During the battle near Kublai Khan's base camp, however, Gwok Jing simultaneously held off the Golden Wheel Monk, Siu Seung Tze, and Lui Mor Singh (after having quickly taken down Wan Hak Sai and having Ma Gwong Jor drawn away from him by Yeung Gor). Even with the help of two partners, each of whom possessed martial arts superior to those of the top fighters of the Cheun Jen 5 Disciples (i.e. Yau Chui Gei, Wong Chui 1), the Golden Wheel Monk could gain no advantage on Gwok Jing and was unable to injure him until Yeung Gor created a distraction that forced Gwok Jing to leave his defenses momentarily exposed. This seems to suggest that Gwok Jing was superior to the Golden Wheel Monk overall.