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I would go for chinjao overall. Vergo was able to use a full body coating which seems pretty impressive so far however at this point I would still argue the stronger overall haki is possesed by chinjao. In this particular context I would argue there is also an issue of what exactly it is they are coating. In a match in this regard we would see chinjao's head against whatever vergo chooses to use. In this contest the winner would be determined by the strength of what they are hardening with haki and the strength of their haki. Chinjao's head is almost certainly harder than anything vergo has considering just accidentally tripping breaks the earth itself. Then we have that vergo probably still has the stronger overall haki even if a full body hardening is not necessarily something he can do (or has a need to do). One way or another I go for chinjao in this one.