Daewoo has softest suspension system , which give you most comfortable drive even on bumpy roads , when you drive on road , observe any daewoo running around specially on highways/G.T roads, u can feel its suspension softness on bumpy roads , so as compare to santro it will give u more comfort.
ragarding cabin noise check thoroughly its dashboard and door panals as well. its dashboard made by Gatta (hard board) so there is minor chance of dashboard cracking , but AC vents , dashboard speaker grill , radio tape consol and some parts of steering wheels made by plastic , which r responsible for rattling and noises, so that should be in good shape. there is some cielos available on pakwheels under 400k budget.