Do I understand correctly that the gold card earns more points than the platinum card for categories such as supermarkets and restaurants? Is there a chart that compares the earning opportunities between the gold and platinum cards?

I don't travel internationally anymore so I'm not sure that I should stay with the platinum card. The airline credit is not useful to me. Bought gift cards. I tried to use it for UA for travel for husband and me. Was told that I would have to separate reservations to use UA gift cardfor me. Could not apply to travel with more than one traveler. Same with AA.

Been a member since 1977. Maybe time to change cards.