...an example is a country has fully adopted crypto and they released their own stablecoin. they also legalize some other big crypto coins like bitcoin, ethereum, and some stablecoins like USDT or DAI. and you become one of the citizens of that country. which one will you use for daily transactions. stablecoins issued by your country's central bank, or mainstream crypto coins like bitcoin. or privately released stablecoins such as tether. or keep using cash because you are used to it. and give the reason why you chose that coin.
Even if a country issues its own stablecoin, this does not mean at all that they accept another cryptocurrency into circulation. Such an example is China, where the People's Bank of China issues a digital yuan, and at the same time the government prohibits bitcoin. There will be no choice in this country, where soon all calculations will switch to the digital yuan.