both are totally different cars.
cultus is very easy to maintain but not the best to drive.
vitz maintainence is expensive but good to drive.
in short if ur a carefree guy who just wants a car to drive around in whatever condition, go for the cultus.
but if u want a bit more comfort even though u know that these cars have already been driven 100000Kms n have the time to spend ur afternoons at shershah looking for used parts go for the vitz.
right now i too am in the middle of deciding which to buy. both have their pros n cons. cant make up my mnd which club to join.