I prefer bitcoin because it is stable and easy to trade. Unlike altcoins, which can be risky, BTC is more reliable and doesn't fluctuate as much.
Who told you that Bitcoin is stable? We always see the prices of all cryptocurrency coins such as Bitcoin, Altcoins, and Shitcoins fluctuate. So it can be completely wrong to say that the price of Bitcoin is stable. For example if you look at the current market, according to coin market cap the highest Bitcoin price in the last 24 hours was about $89,223 and the lowest Bitcoin price was $82,131.
I mainly use binance and bybit since they offer high liquidity and great trading options. Still, I keep an eye on altcoins for short term gains.
Many are trading in altcoins to make more profit in the short term. Before trading it should be remembered that there is a lot of risk involved here. If luck is good it is possible to earn a profit in a short time from Ult Altcoins and Shitcoin while Bitcoin trading will require more time.