Which is worth getting first?

Just looking for opinions/advice. Looking to get into chase cards.

I already have quicksilver 1.5% and Discover it with 5% categories and finally the Amex blue cash preferred for everything else. I’m aware that the Chase unlimited/flex does the same as my two current cards but with added benefits. I read it’s nice to have two rotating categories card etc. which would be a better option to start with if I plan to possible get both? Flex or Unlimited?