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Why would you be wondering? Other than a wheel barrow styled exhaust and a slightly better (and it really is slight) exhaust manifold they are the same car, there really isnt much difference between them.
We bought a 182 recently but only because it was a colour we particularly liked (RB not available on 172) if it wasnt for that there would be nothing about it I prefer to our previous Ph2 172.
Only real advantage the 182 has is colour choice and being slightly newer (although 8-9 years versus 10-12 years is hardly a big difference) it might be in slightly better condition on average.