What are your goals, flying patterns, existing accounts like? What CC do you spend on? All those factors affect where you should credit.
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Oddly enough, Alaska is usually the programme that earns best with CX but this is pretty useless if you dont have a way of getting more of them (though they do sell them)
British Airways have the potential to family pool with a household account and Avios are a useful currency even with a small balance. You will need too use a non-Aus address to register
Its automatic though there are some quirks. See the headforpoints article below. Ignore the avios.com stuffThat's my first preference at the moment, thinking of redeeming JAL flight using Alaska...
How easy to family pool? Does it involve transferring to a single account then redeem?