The Chase Sapphire Preferred card is good for travelers and those who also spend a lot on dining as it gives 2 points for travel and dining purchases. All other purchases earn only 1 point per dollar. The sign-up bonus is quite standard for travel cards - 50,000 points after spending $4,000 on purchases in the first three months. Where this card stands out is redemption options. Redemptions through Chase's Ultimate Rewards site have the best value - if you redeem for travel, your points are worth 1.25 cents apiece. If you decide to transfer your points, you will be able to do it at 1 to 1 value. American Airlines is not the Sapphire's balance transfer partner, but there are other 7 partners including British Airways and United MileagePlus.
If your spendings are broader, the Sapphire card won't perform at its fullest potential. You may want to earn more than 1 point in the general spending category. Both, the Citi ThankYou® Premier Card and the Discover it® Miles cards will let you earn rewards and can be a better overall option. The Citi ThankYou® Premier Card earn 3 points on travel and gas, 2 points on dining and entertainment and 1 point on all other purchses. As for Discover it® Miles card, you will get unlimited 1.5 miles on all purchases. The Citi ThankYou® Premier Card offers a fixed sign-up bonus of 50,000 bonus miles which you will get after spending $4,000 on purchases within the first 3 months. The Discover it Miles does not have a fixed bonus offer but offers a mile-for-mile match, which means all miles you’ve earned first year will be matched at the end of the first year (only for new cardmembers). Thus, if for example, you earn 30,000 miles, you get 60,000 miles. Both cards have equal redemption value for all airlines: 1 mile is 1 cent. One common good thing about these two credit cards is that if you redeem for travel, such expenses like taxes, surcharges, and fees, that are included into a travel transaction, they will be included in the overall redemption as well.
All in all, we would recommend supplementing the Chase Sapphire Preferred card with either Citi ThankYou® Premier Card or the Discover it Miles card as both cards allow cash redemptions and can cover travel expenses that are not covered by the Sapphire card.