It's disgusting how fast electrics have become. You can buy a Traxxas XO-1 that will run out of the box, 100 MPH, you have to have a really fast nitro to top 70... Brushless makes it possible!
I have bn in RC since 1984 and I can tell you electric is the way to go if you are getting into the hobby. If you already have all the nitro support gear, then it is an even split with pros and cons on both sides.
I flew my first electric brushless plane about 6-7 years ago. Someone begged me to test fly it, so I did. It had a brushless motor and some of the new second gen lipo packs on it. Let me tell you something. Other than the sound difference, I could not tell the difference in flight characteristics between that and a moderatly powered 4 stroke machine. And flight times were 20 min with the batteries he had. Add to that, no mixtture issues, no glow plug blow out, no oil cleanup. The writing was on the wall! And the cheaper the electronics get, the harder the arguement is for nitro.
The only pros for nitro I see now are the fast refueling and the ability to constantly run. Changing a battery and charging it still takes time compared to some of the high speed fueling devices in the market. This is mostly a car thing. Also with cars, running an electric motor for long periods of time is hard. Either you need a heat sink for the motor, or you need to gear down so the amp draw is low enough to keep heat at bay. Or you need special motor with magnets designed for high heat applications. The electric motors are not really good at unloading their heat without special considerations. Nitro motors can run all day and night if you supply them fuel and plugs. The heat sinks will unload the heat as fast as it builds for the most part.
If you watch some of the electric RC car races, you would think they are playing the video in fast forward mode. This is really true for on road. Check it out on you tube too.