The power to weight ratio can potentially be much larger. The motors will give you many horsepower/kg and the batteries often have a huge power density, if not necessarily a large energy density.
It's a while since I did the sums but I believe electric motors for radio control aircraft are now managing 10-15 horsepower/kg whereas on O320 will give perhaps 1.6hp/kg.
Some batteries can be drained in less than a minute, so you could potentially carry enough batteries and motors to achieve 2 jump take-offs and landings on a far smaller mass budget than if you were trying to achieve the same thing with an IC engine.
You might be able to combine the VTOL capabilities of an electric aircraft with a relatively small cruise motor burning fuel, to achieve a very efficient hybrid system.