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No skin effect for DC, so less loss
DC is more efficient than AC because there is no losses due to frequency and harmonics in DC. The frequency of DC is zero and voltage are constant in DC so DC is more efficient than AC
There are many reasons
But I think dc power transmission is more costly due the cost of equipments used
this case is for High voltage DC, not in general,
there are many reasons that can be taken into consideration when we compare between the two technologies, as an example of the advantages of using DC:
The used cables in DC need less cross section area because there is no skin effect in DCalso we need 2 cables instead of 3 cables per circuit, which means lower cost.
On the other hand the initial cost of implementing such technology is very high with compare to the existing AC grid