These two fintech stocks are exploding, but they have different stories.SoFi Technologies (SOFI 1.72%) and Robinhood Markets (HOOD 0.23%) are two of the hottest growth stocks on the market today. They're both financial technology, or fintech, stocks, and they're growing fast.Robinhood has emerged as a surprise winner after its original meme stock status, and its stock has exploded during the past year. SoFi has rewarded investors as well, but not nearly as much as Robinhood. But what happens next? Let's see ...