Thanks for all the answers!
Then which chain should I use to store USDT?
I won't store USDT because it's not the safest stable coin, read
[UPDATED] PSA: Most Stablecoins Can Be Frozen, Even in Your Own WalletsI'd choose to store DAI i.e. decentralized stable coin in hardware wallet.
You can also choose to store foreign currency in banks because it's insured (there's a limit depends on each country).
So saving assets in USDT can also result in loss, in crypto, can that lose value like LUNA had yesterday?
This is an enlightenment for saving stablekoin assets, thank you, friend,