Bitcoin is the most important coin and no alternative coin can overtake it. I think investments in bitcoin are the most reliable and not risky.
As stated, there is no other asset to overcome the market of bitcoin, as the name describes altcoins always serve as an alternative to the bitcoin. Investing into altcoins were risky, but at times what's been earned through them is bigger than that of bitcoin. Bitcoin on the other hand gives the assurance on the profiting.