I prefer to work with cryptocoins which are familiar to me. That is why I make investments into cryptocurrencies which are in the top 20 on the market. Bitcoin and Ethereum are the main assets for putting money in. This is my opinion and I think it is true opinion!
I also prefer to invest in old altcoins that are included in the top 20 in the market, it's much safer than investing
in new coins, I prefer holding old coins that have good potential and prospects in the future
Same old story about holding coins, it doesn't matter if its an old or new. What's important is you know exactly the coins you're holding of, and you had updates of its community. Even if that coins was old but didn't have good product to sustain it's market, still it's worthless.