For me, I think Bitcoin will always be leading.
From my perceptive, I feel that altcoins won't do much if the price of Bitcoin remains stagnant. In most case for an altcoin to break a price barrel, there will be a rise in the price of Bitcoin.
There I suggest anyone who is buying or investing in any altcoins should at least invest in some Satoshi. Its a safer alternative.
There is no doubt that bitcoin must be on the top of list because no coins that can assure as profit specially if we can Keep it for a long time.
I have my bitcoin more than other currency in my folio.
I prefer BTC, cause Altcoin market is depended on the price of bitcoin.
Current Bitcoin market is on a bull flag and it is sure price will not fall before next halving,
so it is better to hold Bitcoin for a long time, I think it will not disappoint us.
But dont forget mate because alt coins can grow more than what bitcoin can give in a short period of time so still diversification is the best way to handle our investments here