Not credit advice. Facts and math from issuer pages and the CFPB, each with its date. Offers change; approval depends on your credit. Verify on the issuer's site.
Rubric: Discover it Cash Back leads by 17.2 pts. Scores: Citi Diamond Preferred 56.4%, Discover it Cash Back 73.6%.
At a sample $1,920/month (groceries $500, dining $300, gas $150, travel $150, online $200, other $400 …): Citi Diamond Preferred nets $0/yr, Discover it Cash Back nets $230/yr after annual fees. Use your own numbers →
Late feeup to $41 up to; $0.00 for first occurrence; $30.00 if not charged a late fee within last six billing cycles; $41.00 otherwise files.consumerfinance.gov, 2025-12-31
⚠ Late fee up to $41 · Rotating 5% quarterly categories need activation and change each quarter; not modeled (we count the 1% base). First-year Cashback Match not counted.
No paid placement. No issuer pays VaultRubric for inclusion or rank; links go to the issuer's own page. Ranks come only from the published rubric below.
FAQ
Which is better, Citi Diamond Preferred or Discover it Cash Back?
On VaultRubric's rubric: Discover it Cash Back scores higher. The better card for you depends on where you spend; the calculator shows net value for your spending.
Estimates, not financial advice. Taxes, insurance, PMI and fees vary by lender, county and city; confirm with your lender, dealer and state agency before acting.