While you're mentioning stable coins, it might be worth mentioning DAI, which unlike the others, is decentralized and managed by a public smart contract, instead of being centralized and managed by a single company which could lie about its reserves and could choose or be forced to shut down.
There is one small issue with DAI in my eyes. It has been trading for a premium, while at the same time you can't make a profit from owning it because the spread is always an issue. I am testing an automated contract that does 3 way arbitrage between USDC/USDT/DAI and it has never once crossed over to DAI, while USDC/USDT cross each other enough to trigger a trade, 1-2 times a day.
