They can carry five to 20 times more current in the same unitarea while reducing the amount of energy lost as heat by 75-97% (depending on whether the current is alternating or direct), even after accounting for all the nitrogen-cooling paraphernalia.
But the sober message about wind and solar applies to all renewables: All renewables, much as I love them, deliver only a small power per unitarea, so if we want renewable facilities to supply power on a scale at all comparable to our consumption, those facilities must be big.