what is the safest Stable Coin and What is the cheapest network out there ?

hello. so basically i trade forex a lot and i would like to store my money in crypto because the broker i trade with allows for crypto deposit/withdraw. i have large sum of money and i'm really scared. i don't want my money to evaporate. i don't want to lose my money to another luna-like event. as of right now im Storing my money in PAX with BEP20. and im not sure if i should move it to BUSD or maybe USDT with TRC20. i already have a ledger nano x. please help me to take an informed decision.
Thanks !