It depends on the way you are going to use the Discover it® Miles. With Rapid Rewards card you will have more return on Southwest Airlines expenses and on Rapid Rewards and Car Rental Partner purchases. All other expenses will bring back more if you charge them to the Discover it® Miles card. The Discover it® Miles card can become a good addition to your existing Rapid Rewards card.
Disclaimer: This editorial content is not provided or commissioned by the credit card issuer(s). Opinions expressed here are the author's alone, not those of the credit card issuer(s), and have not been reviewed, approved or otherwise endorsed by the credit card issuer(s). Reasonable efforts are made to present accurate information, however all information is presented without warranty. Consult a card's issuing bank for the terms & conditions.
All rates and fees, and other terms and conditions of the products mentioned in this article/post are actual as of the last update date but are subject to change. See the current products' Terms & Conditions on the issuing banks' websites.