Many people will recommend using USDT, the fact that this currency is also used the most, but it is also the most stable stable currency. If you plan to keep it for the long term, my advice is not.
USDT is also the most controversial stablecoin. There are other better options that are having independent audit without any issue like TUSD and USDC (from coinbase and circle). I think these two options are better than USDT and paxos. Decentralized stablecoins are also a solution but they can break like many smart contracts that have broken in the past due to price fluctuations.