Ive Owned a KA and Now have a Company Car Clio Diesel... The KA Build was appaling, the seat cover wore through in under 10k miles, the clutch went on it and 15K miles, The Coil pack failed at 20k miles and the spark plugs seized in it
On the Upside it cornered like it was on rails.... Was lacking power though used to struggle above 65mph

But there are many cheap conversions out there... Mate has one with a 1.7 puma lump in and its great.
The Clio on the other hand is Bomb Proof... (Being a company car) its been driven Hard, Red lined in every gear, Run low on oil taken on other cars on the road it shouldnt have etc etc etc and the only complaint i have is the Sunroof Rattles!
If it was my Money (As much as i loved the KA's handling) would be the clio.