1.5 Yaris is the only yaris worth buying, 1.3 is nothing but wasting money. Bigger engine is not the only benifit 1.5 offers, seats are better, has acoustic windscreen which adds alot in silent cabin, moreover you get climate control, smart entry and push start, much much better speaker setup, MID in dash which no other car in this segment offers etc.
1.3 is so sluggish... it feels like the old gli, sabr azmati hay, better opt for 1.2 city over 1.3 yaris, feels alot better.