I currently have an AMEX Business Gold Card and Chase Amazon Rewards Card.

I realized I should probably stop using the card which offers the least amount of rewards value. Has there been indepth analysis done before on which type of card offers the most valuable reward system? And if so, which type of reward you should card in on using your points (most bang for buck).

I have about 50,000 points with both credit cards and it would be a major hassle to see how much was spent on each credit card total in order to determine how many points I received per $$ spent per card.