comparing rwkw to kw at all 4 wheels

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I hear a lot of people talk about power at all 4 wheels with AWD cars, then on the other hand I hear the RWD lads chime in about how my rwkw they have in their cars etc and how superior that power is.

One thing I'd like to know theoretically speaking is how does a car with 200kw at AFW compares to a 200rwkw RWD vehicle, assuming both vehicles weigh the same and got the same traction off the line?

Is it considered the same kind of power? Which car is more powerful/quicker? The one with power to AFW (all four wheels) or the RWD car? Is it purely a traction thing?

Please keep this thread civil.