The Aygo, C1 and 107 are all the same platform, its a shared platform between the three and no one manufacturer is the dominant owner. Anyway, the Yaris is a clearly superior car to the Aygo, if you really must buy the Aygo im certain youll get a better deal from one of the French variants and youll get more kit, if you believe the Toyota is some how better then you're wrong, they are the same. Though the Yaris is overpriced and has some stiff competition these days and its a quite old design compared to the competitors, so i wouldnt look at one unless i got a really good deal and service plan.