No trying to find a way to charge them on location. No need to swap out batteries every few minutes. Don't degrade over time. Both in the long run and per run. Gas cars run as strong as when you first start them all the way until they run out of fuel.
Exhaust fumes can leave an oily film on the vehicle that dirt loves to adhear to.
More matience required as well more tweaking to keep engine running top notch. As you get experience, this becaomes less troublesome. Gas engines can be tempramental where as electrics are always ready to go with a good battery. Gas engines are noisy. Not always something you can run for very long out front of your house unless you have very understanding neigbors.