Well if you are ok with 15 inch rims, then its fine.
But what I know is that company already choose the best fitting option for their cars. And originally vitz, passo, yaris, comes with 13? inch rims. If we are going to install big rims, it will certainly bring some uncomfort somewhere either for car or for rider. Its from my own experience.
I had mehran for more than 5 years and friend asked me to install 13 inch rim in it. I took his advice and joy of ride went miles away. I immediately shift back to 12 inches rim. But I choose tires of 165mm which gave enough comfort as compared with its original tires of general of 145mm.