A chain driven engine is not the be all and end all it is made out to be. I have learned (on this forum) that not only can chain drives be more trouble than belt (such as VW TSI), but even on more reliable units, the reliablity only comes with proper regular servicing.
As for the Corsa being weak, it has pretty much exactly the same power as the Yaris, 84bhp vs 85bhp. It isn't that the Corsa is likely to be unreliable and I know of no particular faults with that engine, its just that, overall, the Yaris is likely to be more reliable.
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