Hi — I am hoping to one day hold the AMEX Blue Cash Preferred Green / Gold / Platinum. Plus potentially the Amazon Prime Visa (Whole Foods; Amazon) and BILT (for rent).

I currently have the AMEX BCP a Capital One Venture, which I expect to downgrade to a VentureOne once a year passes.

My key question is: what card should I get that complements the AMEX ecosystem effectively, specifically:

1) earns strong points and bonus multipliers across the board

2) is good to use while traveling and spending abroad (helpful to have VISA / Mastercard here)

3) offers some benefits or statement credits NOT offered by AMEX (e.g., Chase Sapphire Preferred or Reserve providing primary rental car insurance — which AMEX Platinum doesn’t provide)

Looking really just for one such card. I have thought of the Capital One Savor / SavorOne, the CSP / CSR, or the Chase Freedom Unlimited or Flex.

What do you recommend?