Go for vitz, but getting a clean vitz in 12-14 model will be super super difficult.
If the choice is b/w vitz and nissan dayz then close ur eyes and go with vitz.
If you want other than these, go for 2011-2013 gli eye closed. They have good ride, better fuel average, better road grip, spacious interior. I have kept a very rough used 2009 gli and i was very much satified with vehicle strength and reliability.
If u are getting vitz, dont geta vitz lower than 4 grade auction. Dont take a vitz which has even a minor toucbing in pillars, roof, diggi and bonut. And do check its engine.