In this current bearish markets, some school of thoughts believe it is better to stay long on USDT in order to remain safe while others think it is better to stay long on BTC as one will always have more of USD once the market gains momentum in the bullish season.
Which is better?
As I think, you should choose both, but most should study bitcoin because in the long run, bitcoin is a form of higher interest rates than any coin in the market. Keeping both will bring versatility, many different stages. In investment, diversity and flexibility are very necessary.