That you most enjoy.
I use a credit card for everything in my life as long as it’s an accepted form of payment with no additional charge. I pay it off in full each month to avoid interest. That gives me the free use Of the credit card issuer’s money from the time I use it to buy something until the balance is paid wash month. It’s like an interest free loan. I like the record it creates too for all my spending. Makes it easy come tax time.
I use a chase southwest card because we like to travel and southwests companion pass is the best travel perk on the planet.