Since its inception, it has been one of the most actively traded ETFs, even with the introduction of other S&P 500 ETFs.
SPYX has a fossil-free stance that makes it tilted towards certain sectors. This means that they remove firms with fossil fuel reserves, coal, or natural gas.
SPY is considered a large fund with an AUM of $430.34 billion while SPYX is a small fund with an AUM of $1.36 billion.
The expense ratio of SPY is 0.09% while SPYX is 0.2%.
It all boils down to which asset value is aligned with your diversified portfolio. You already made a good investment strategy as you did due diligence on both commodities before investing.