Undoubtedly, the best altcoin in the market is Ethereum. The price of Ethereum was above $4000 this year, Now the current price is now hovering above $3100. As the price has gone down a lot I think investing in present market will not be a very wrong decision this is my personal opinion. 

My portfolio: Bitcoin 40%, Ethereum 40% and other alt meme coins 20%
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How much of your money you invest in which coins is up to you.  Of course it is better to spread our coins in different portfolios.  But I wouldn't invest any part of my money in meme coin, it gets lost quickly.  I would prefer to invest 75% of my money in bitcoin and 25% in ethereum coins.