Which one is the best for 19 months, CD or HYSA?
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It totally depends on your needs for liquidity and interest rate stability. If you are sure that you don't need the money for the next 19 months, then a CD offers good, guaranteed returns. If you want the flexibility to withdraw the money without penalty, HYSA is good.
One more thing: CDs have a fixed rate, while HYSA rates can change. If interest rates rise, HYSAs earn more; if rates fall, CDs offer better returns. So, it's a strategic gamble.