IMO Paxos Gold will prevail over DGX, but both are stable.
The only gold-backed token I'm avoiding is Tether Gold (XAUT). If SEC goes after Therher (USDT) or they failed to prove $20bn in reserves, people will make a bad name association.
It's always important to separate the good ones from the bad ones. I have never trusted Tether because of its shady operations. There's no telling if they'll be able to live up to their claims of backing their stablecoins with real world assets. Investors buying Tether Gold will be fooled in the long run, as Bittrex shuts down its operations. Both Digix and Paxos Gold are the most trusted Gold-backed crypto assets on the market because of their regulatory compliance. More legitimate options are needed in order to ramp up the competition on the market.
As long as these so-called Gold-backed cryptocurrencies retain their value, investors will be able to enjoy the best of both worlds. The goodness of Gold combined with Blockchain tech, opens up a whole new world of possibilities. We could see renowned companies, banks, and other institutions offering Gold-backed tokens to their customers. They will hold physical Gold for you in a vault, redeemable anytime for the Gold tokens you hold on the Blockchain. It's similar to an IOU or a Gold certificate. In my eyes, Digix and Paxos Gold will always be the best Gold-backed cryptocurrencies in the world because of the many benefits they provide to investors. Regulatory-compliance is what makes them a trustworthy investment for the long term. Just my thoughts