I would recommend the Fiesta
If you bought a Corsa then you would have to drive a Corsa
In all seriousness, the earlier Corsas were very poor cars, very much built down to a price, the build was poor, the ride and handling was bad (just a cheap car)
the lower capacity Vauxall engines were horrible gutless things - the bigger, ones were often a little more powerfull than the Fords (Petrol)
So traditionally the Ford had better handling, better, more comfortable ride, and better build quality (interior etc)
As time went on, the Corsa improved (when new models were released) so the later models were much better compared to earlier ones (The Fiesta is a better car IMO)
Often, you will pay a bit more for a Fiesta than a similar age/ spec of Corsa, there is a reason/ reasons for that..........
I personally still favor the Ford though and would choose a Ford over a Vaxhall (my pesonal choice- after owning a 1.9 diesel Vectra - what a piece of

)