Lets get strainght to the point.
Nitro powered cars will go faster in a straight line with off-the-shelf equipment than electric cars will.
The most powerful electric brushed motors are putting out 350-400watts, which is around 1/2hp. Most nitro engines produce this much, many produce more.
In favour of the electric cars is the lighter weight, better starting power and smoother control.
So, in a speed run, a shop-bought nitro car will almost always beat a shop-bought electric car.
Around a small/medium-sized track (like most clubs have) an electric car will almost always beat a nitro.
No doubt someone will argue with this post and say the electric cars hold the speed records and that their oversized German brushless motor is faster than any nitro. But that isn't representative of the hobby for 99.9% of people.
Some people go for nitro, some people go for electric, both have their benefits, both have their drawbacks, both have their place in the hobby, there is no need to argue about it.