It is difficult to speak for specific coins, I think the whole altcoin market, namely the top 50-100, is quite acceptable for investments in the medium-term - long-term.
But I much more like participating in IEO on major exchanges such as Huobi, Binance, Okex, Kucoin.
Perhaps just narrow it down to top 20 to lessen the risk you will take. And if ever you are really persistent then just choose the coins on those top 50 that have those products because devs are abusing us and taking our investments for granted where they just continue developing with no products to showcase after a year and even it has, it is just ugly website and beta.
I will only agree to IEO if we were back to 2nd quarter because now, it has slowed down and does not make any much more money but it was really, really profitable to those who luckily participated earlier.