I use and like the following cards
Amex Plum Card ( i am at the 2% back locked in, i think it is 1.5%)
There is a new capt one business card that gives 2% cash back also
Those are great for cash back.
Then if you want some with reward points, the chase, citi, boa are all good cards as well.
I have about 20-30 cards mix between business and personal and spend around 500+k a month on credit cards.