The Nigerian Naira has been stable for a few months, and it's encouraging. However, I will choose both of them based on different conditions. USDT will be my choice if I want to keep my funds for a short period. And it will not be a huge funds since stablecoin is centralised. We don't know if a USDT is really backed by one dollar. Bitcoin will be my option if I want to keep the funds for a long time and if the money is substantial. Bitcoin is decentralized, so it is safe to keep and it is also profitable in the long run.