You are wrong. DC is better to be transmitted, because the only loss is the resistive one, in AC you have also inductive and capacitive loses, but DC is not used because the switching to a lower or higher voltage is much more expensive. In the past, it was available to switch the voltage level just in AC with low losses, DC needing high voltage switching electronics, that was unavailable at those times. Few evolved countries started to use high voltage DC transmission lines on very long distances.