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Spend about a grand a month and clear it every month, basically from a pint of milk to our main holiday goes on the credit card, we literally use it for anything we buy.
Currently on a Tesco Clubcard thing but the reward  points seem to have dropped off just lately so maybe looking to change.
Airline loyalty normally worth a look if your a frequent flyer, but rewards are only good if you would buy that thing anyway.
We ditched our Tesco after the rewards dropped so much. Shame as there are good 3 for 1 offers. Currently trying NatWest rewards which is ok but will be interested to hear of others.
Amex cashback is the best on pure value, or their ba cobrand card is good if you can use the companion voucher for free flights