santro's suspension needs work more often, a lil bit congested than cultus, its more prone to rolling over due to its height.
prose are better build quality, soft steering once the car is moving, great a/c, and its body is also really strong, i've seen a totalled santro '06 being sold for 6 lac in 2012 after repairs. the new owner didnt even think for a sec that it was accident. and was happy for buying a genuine car. 