It's not a matter of named attack. It's a matter of battle situation. Kuzan was going all out in a war against Jozu, not the same case with Doflamingo
I rate Jozu higher because he actually has better feats and portrayal. He could stalemate an admiral until distraction, which includes reaction speed, stamina and other things like that especially when talking about a fast admiral like Kuzan(just look at his leap at the beginning of the war), a feat Doflamingo will dream his entire life to accomplish. He has one of the best strength feat in this manga, only rivalled by Garp maybe that shits on any physical strength feat Doflamingo ever showed. He has the best defense in the world, capable to block island level slashes, another feat Doflamingo would dream himself to accomplish
Better portrayal as well because in the chapter "conflict at the summit", he was the most highlighted alongside admirals, Mihawk, Marco, WB when Doflamingo was ignored on the background
The blindside Onigumo-Marco style isn't changing that