I saw the A500 and the AGP parked side by side on the Abarth stand at Le Mans in 2009 - they both appealed, being economical compared to my other cars at the time and a bit of poke for fun.
When it came to it though everything about the A500 felt brash, but somehow effeminate. The AGP was just a bit more understated, wasn't going to get every Corsa driver revving you at traffic signals and with a child seat to fit in the back, just a bit more 'useable'.
Horses for courses I guess, just depends on the buyers lifestyle and requirements.