Personally, I believe that Bitcoin is the most reliable coin for long-term investment. The leader of the crypto currency in the market for a long time.

I completely agree with you, I also believe that BTC is stable and can bring a stable income, while Altcoins are not so stable and can fall in price in a short time.
I think there is no stable crypto, all depends on market capabilities. Market increases and decreases can occur quickly, as well as increases. but I think this rapid change is actually beneficial for those who can use it. because actually the market conditions that move quickly can provide traders with a short time.