Power/Weight Ratio (PWR)

Take two imaginary cars:
Code:
       Power  Weight   PWR
       -------------------
CarA   200HP  1000kg   200
CarB   300HP  1500kg   200
Note that they have an identical PWR of 200HP per tonne.

Which will have:
- better 0-100kmh time?
- better 0-400m time?
- higher top speed?

Which will be perform better:
- on a slow track?
- on a fast track?

I ask these questions because all car databases will rank cars by PWR so when you look through the lists how do you choose which of two cars with identical PWR to buy? Is there any case where a car with a slightly lower PWR will perform better than a car with a higher PWR?
Code:
       Power  Weight   PWR
       -------------------
CarC   291HP  1500kg   194
CarC has a worse PWR than CarA, how will it perform relative to CarA?
 

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