To me, any racing is fun racing. I however prefer nitro, for one thing, because of nitro enine tuning. I'd prefer to tune an engine than a motor. Second, there is very little electric racing here anymore. Third, there are a lot of nitro on-road racers and more is better. It means more people are likely to be as good (or bad
) as you are, so that means more closer racing. Nitro racing costs a bit more at one time. All I buy is tires and fuel after my original purchase. I buy like three glow plugs every 3-5 months but I get everything else during the original purchase. This could make your first purchase around 1300 bucks, but if you are like me, you won't be paying too much afterwards.
I don't know if electric would be more expensive, but if you want to be on top I could see how.
If I were you, I would go with the class that is more popular in your area because I always love to race with as many people as possible.