For investment it would be wiser to invest in bitcoin because it is more stable and the increase can be very high. Reputable altcoins are also good for investment but are more efficient when used for trading than investing in altcoins.
Reputable altcoins are also goers wherever bitcoin is.
It's wise to invest bitcoin as the usual and have it for a long term hold. To prove that it has always been the best choice, you hold it effortlessly. There might be some altcoins that can grow more than bitcoin.
But it's going to be a hard deal for you to find it out. Especially right now when everything is going down.