The Discover it Card (not the Discover it chrome Card) is a great, but inconsistent card. It gives the standard 1% back on everything, but it also gives 5% back on a sort of "category-of-the-quarter". This means that some quarters the card is useless, but some it gives great rewards.
The U.S. Bank Cash+ Card gives 5% on two spending categories, which is very nice. Especially noteworthy is that "cell phone providers" and "home utilities" are two of the available categories, letting you set some of your highest recurring bills to charge the credit card automatically and just passively get cash back from this card without having to even use it elsewhere.
The American Express Blue Cash Preferred Card is the best card for typical grocery and gas spending. It has an annual fee, but it will easily pay for this over other high-rewards cards by its unbeatable rewards program.