Note that you need a premium Chase card in order to transfer points out, and this qualifies. Combine with Chase Freedom and their 5% categories to get more Ultimate Rewards Points. While United is the most commonly cited one (I burned 160,000 miles in business class for me and my mom for a last minute family event, which would have cost $3,000+ with cash), don’t overlook BA Avios or Hyatt (good Hyatt redemption values in major cities like Seattle).
The one reason you may not want to sockdrawer the Double Cash just yet is that the BOA card is a Visa (after all, Visa used to be called the BankAmericard). There are certain use cases like Plastiq where MC is accepted but not Visa. As for Chase Sapphire Preferred, just make sure you have another premium card to transfer points out of, should you use that option. I personally use Chase Ink because hitting Staples when they offer rebates on Visa/MC/Amex GC pays for my membership fee, but that option of a 5X premium card is no longer available.