Thanks for sharing, a few points on some

DAI: its true they are algorithmic and until recently they were backed by USDC, now i think they are back by govt debt (not ideal)

USDC: probably the most regulated (safer) yet they are heavily backing Eth & Sol ecosystem, in particular in DeFi but if they domino starts falling then they are in trouble even if redemption is working fine yet when trust is lost u never know what can happen

USDT: battle tested several times, not sure about their fiat backing (shaddy and dont have full trust) yet the company supports BTC a lot .. I expect to see USDT on LN

BUSD: is well regulated

IF you want to keep dry powder then Fiat is best, I chose to keep 1% in USDT on CEX and planning to use it to buy BTC then cold storage