Both the Citi Custom Cash Card and the Capital One Savor Cash Rewards Credit Card offer enticing cash back rewards and no annual fees, which is why you're likely considering them. The Savor Cash has a higher cash back rate in popular categories like dining and entertainment and it has a generous welcome offer.
However, the Citi Custom Cash Card is also a strong card, especially if your spending is concentrated in one category. Citi Custom Cash offers 5% cash back on your top eligible spend category each billing cycle. Both cards are suited for those with good to excellent credit, so your decision may come down to which rewards structure suits your spending habits.