The polo was alot 'softer' than the
ibiza, takes speed bumps nice and softly, but goes really wide when pushing it on the corners.
The
ibiza has more special edition models meaning more toys for your money, the ride is firmer so bumps arent as great but as a result the car doesn't roll as much as a polo. The
ibiza has a bigger boot and imo a more sporting look to it.
As craig has said bang in some decent GTi or Cupra seats and you'll be away. The only decent sports seats in a polo were the 1.4 16v ones and they aint easy to come accross.
One final bonus for the
ibiza is that you get rear speaker wiring in there whereas on a polo you dont.