at this time I prefer USDT as the best altcoin and suitable for investment, because the price of the coin can be classified as a stable coin and far from the risk of losing money, but if you want to choose a coin under $ 1 then the right choice is doge, the explanation same as I said before.
What sort of bull crap? Do you even realize that USDT is a stablecoin? It is not a coin that is suitable for investment, as USDT is pegged on part with the United States Dollar. It's exchange rate is stable at 1 USDT = 1 USD. Tether was created in order to get through the ban on fiat currency usage in cryptocurrency exchanges. It has no other uses.
Holding USDT for the long term is illogical. If you want to hold, then hold United States Dollar banknotes. The returns will be the same, and the risk will be lower. But I don't understand why you want to hold the US Dollar, as it's purchasing power is going down every day. Usually people don't hold fiat currency. The preferred assets are gold, stocks, mutual funds.etc.