Originally Posted by
moe8555
You may want to consider Citi Premier, which would add 3X supermarkets and gas, valid worldwide, as you are already a Citi ecosystem participant. Also, an interesting fact about the Citi Prestige/Premier is that their 2 year extended warranty benefit is also valid for purchases worldwide, not just from U.S. merchants or products with a U.S. manufacturer's warranty.
This and this. I spend most of my time in Japan and Citi Premier has become my regular day-to-day card. The bonus categories code correctly most of the time, which is not my experience with Amex and Visa. And of course Mastercard is more widely accepted than Amex in most areas.