I had CapitalOne Spark first; after several attempted account takeovers, I cancelled and switched to Citi cash back (blue&green). Newly I picked up a Discover It- 5% rotating categories with 1% on everything else. The kicker is a promotion where all the cash back is doubled for the first year and one quarter the rotating category was home improvement. So there were a lot of lowes/home depot purchases made that quarter for 10% back!