So far this year, shares of Bitcoin (CRYPTO: BTC) mining stocks have been on an absolute tear. If you thought Bitcoin's 85% gains were impressive, just consider what two of the top Bitcoin mining stocks have been up to. Marathon Digital Holdings (NASDAQ: MARA) is up 460%, while Riot Platforms (NASDAQ: RIOT) is up almost 500%.

Those are head-spinning numbers and a good reason some investors are now rushing to buy Bitcoin mining stocks hand over fist. So which is the better buy right now: Riot Platforms or Marathon Digital? Let's dig into the numbers.

The starting point for any comparison is the absolute amount of Bitcoin these companies are producing. After all, both Riot Platforms and Marathon Digital are essentially pure plays on the future price of Bitcoin, so it only makes sense that the more Bitcoin they can mine, the more valuable they become. And right now, Marathon Digital is the winner. In June, the company mined 979 bitcoins, up a whopping 599% from the year-earlier period. In comparison, Riot Platforms mined 676 bitcoins in May.

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Source Fool.com