What is better about the v-twin motors versus the others?

 

The nice thing about a V-Twin is how smoth the engine produces power thought the RPM band. Most will feel more powerful than a single cylinder engine tho in reality size for size they dont really produce any more power. As a rule of nature a single will usually produce more low end torque hence a "Thuper engine"!

 

Smoother engine as it is better balanced. May put out a couple more HP than a single cylinder, but not much. Single cylinders tend to be, as said, more torquey.