xA = Echo/Yaris platform. They're nice and reliable and I think they would basically be very close.
Your choice doesn't come down to reliability though, it's more of what YOU want, the xA is more of a gas miser than the Corollas and of course the xA has a 1.5L motor with about 105hp as opposed to a 1.8L 130hp motor on the Corolla yet the Corolla still manages to pull great fuel consumption numbers. Of course the styling on both is great, but I think the xA is a little nicer looking than the Corolla.
The xA is not available in Canada, so you would have to export it or buy it used from a dealer who has exported it from the US, Either way you end up with a Toyota though.