They make 170HP, 4cylinder cars that would destroy my v8 truck in any kind of race. Why? because my truck's engine is powering a bulky truck around with it, while basically everything in the car is designed to use its power more efficiently. You can kind of compare this to computers (from what I understand windows slows down a computer a great deal more than osx. correct me if I'm wrong)
I have used both though and found no useful benefits of a more powerful HP laptop over my macbook. I'm not saying that they are superior to PC's by any means, but look around and see all the people using macs. Macs aren't just for art kids anymore, science students, even engineering and business students are using them now (although often using microsoft software when they have too). Apple can't sell that many computers on good marketing alone, they obviously are getting the job done.