pulsar 200 is marginally more powerful and has less mileage
180 gives around 40kmpl and 200 gives around 30
spares obviously are cheaper for 180
200 is a little hard to flick in city traffic though it has good low end power
as for me i went for the 180 as 200's were being called back for front fork problem and 220 wasnt launched so i stayed on the safer side