Cole does not have the ability to directly absorb weaponized electricity. Not even his older and much more experienced self had the ability, while Electro might. And we don't really know what kinds of things Cole can do with the power he gains from the ending of inFamous 2. And as far as we've seen, all he did was gain the power and currently has no experience using it.
I'd bet on Electro.
All hail Scythe, King of the Sigs.
EoS dark Cole had the power of his lighting and ice/or/fire-ish powers + the Beast's own. So adding more powerful pyrokinesis, 100+ ft lava form with higher stats and that atomic regeneration.
IF Cole can use the Beast powers as well as John could, he would destroy Electro. Otherwise.. iirc electricity doesn't effect either of them, so I'd say Cole seeing as he has more variation of his powers along with ice/fire powers.
"Gonna need more chloroform..."
"If you look down on us, judge us, condemn us... then you shall fear us!"