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.
Specs:
5% back on two categories of your selection
2% back on one separate category of your selection
The Robinhood Gold Card sounds essentially unbeatable for everyday use. It gives 3% back on everything, which is the highest flat rate there is by a large margin. (And honestly probably unsustainable, but enjoy it while it lasts.) The downsides are that it requires a Robinhood brokerage account, that it has a $50 annual fee, and that is isn't actually available yet. The annual fee does give some brokerage benefits too, but these are negligible. Still, at a 1% rewards premium, that would pay for itself with just $5000 of annual spending. If it ever comes out, it's a strong contender for the best card.
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. The downside is that Walmart is not considered a grocery store, and Amex isn't accepted at Costco so its usefulness really depends on where you get your gas and groceries.