This is not the time to suggest or pinpoint those coins that has a potential in in the future. Some of them have future in accordance of the market. Right time will give you a possible coins but for this time i prefer btc and eth.
Bitcoin and Ethereum are the best Altcoins that are able to rise and grow well, Ethereum will help with Bitcoin deficiencies and if you choose both, you will get big profits. there is still good and potential Altcoin, but it all depends on which one they prefer which one they think will be profitable, but not easy to believe in new coins because it's not all good.