If bitcoin price have increased, I can decide to convert some to USD or stable coin. Which one is better? Or is there other alternative which can be comparable with bitcoin in a way it would be independent and having full control characteristic.
if you want to convert and sit on USD for
short time then you can convert it into USDT(
short time because it's riskier) because when you may want to buy more BTC you no need to convert your USD to USDT to trade BTC/USDT pair.
and if you want your money safe in bank account.. then you need to convert into USD and keep them in bank.
if you also stake crypto then converting into USDT gives you 7%-10% interest rate and in bank the interest rate of USD is 5%-6%. But staking is risky.