I am interested in this question as well...no answers yet, but maybe this bump will get us some.
Been to both, while Chacchoben was nice, they only uncovered about four buildings, not too many visitors although they probably get their share of folks off the tour boats when they are in Majahual.
Really liked Kohunlich, got there early and we had the place to ourselves and was able to climb on a few of the buildings.
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