the best credit card on the market

Currently have a ANZ GOLD, one for me and one for my misses at a cost of around $300 per year. Thought I would look into getting a debit visa card (instead) as we pay off the card every month and we don't get a lot back from frequent flyers.

If anyone has any advice, hidden costs and or cheapest interest rates etc i would be well chuffed.

Thanks in advance..

Carlisle