In terms of official one piece logic, Crocodile would be more busted because logias are hailed as a wonder of devil fruits.
But in terms of using your own actual brain cells, moria is far more busted. We are way way beyond logia's being overpowered. Ever since we arrived in the age of haki that renders devil fruits almost obsolete in comparison, nobody fears a logia user anymore for their logia abilities, only for some title they possess.
For a fight between strong characters this only leaves the utility or power enhancements of the fruits as the important factor, such as with a zoan or a paramecia. The only real utility you get from logias is dependent on the environment otherwise it can also be a con and otherwise it's just good for some freedom of movement I guess?