You can't go wrong with either honestly. If you're looking for a cheap and easy daily driver, Corsa is for you. But if you want something that lasts, saves gas, and holds its value, the Yaris is the better bet.
Both are solid, but I'd go with the Yaris, it has better reliability, resale value, and hybrid option. The Corsa is fun and practical, but I think Toyota’s reputation gives the Yaris an edge...