It all comes down to how strong HK Harald is—especially when you compare him with Domi-Rocks.
If one is significantly stronger than the other, i assume it's Domi Rocks?
1. Domi Rocks probably got bigger boost in strength than HK Harald, which is why he ( and other Domi victims like Dorry and Broggy ) grew massively in size, indicating massive boost in physical strength
While HK Harald, didn't grow in size right?
2. While Domi Rocks and HK Harald got this similar portrayal of monstrously strong ACoC barrier protecting their bodies, Domi Rocks split the sky on his own, a feat which HK Harald didn't do
Edit : solo sky split which only Joyboy has done so far
3. Domi Rocks also pushed 39 & 40 years old Roger - Garp to their limit, ( and i assume both were in prime ), who're stronger than this Gaban and Shanks
And, if we refuse to buy into Loki > Garp and Roger combined, and wait to see how Shanks captured Loki, we may also put Garp and Roger > Loki for the time being
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What are the points for HK Harald? I only wrote points in favor of Domi Rocks being stronger