As jags86 and jerseytom have pointed out, the answer to this hypothetical question will hinge largely upon your spend profile but, realistically, so far as bucketing into categories is concerned, the average consumer's largest category is likely going to be food and groceries. There Gold Card is the clear winner.

As jags also pointed out, the EverDay Preferred gives the Gold some competition in that realm but, while EDP offers 2X on Gas/AmexTravel, Gold offers 3X on Flights. Gold also offers slightly watered down versions of Purchase Protection/Extended Warranty/Trip Delay (Note: no Trip Cancellation), which you note as being a consideration for using Platinum. Add in the fact that the Gold's AF is largely negated by the Uber and Dining Credits and I think you have a very strong contender for a card, if there can be only one.