I think all coins in top 30 are or will be profitable. Can't name the only one though. Too many great projects and teams behind them.
All the best highly recommended cryptocurrencies are profitable and even the traditional business or investments are also profitable but we can differ by its profit amounts. Crypto trading is more profitable than traditional, furthermore Bitcoin trading is more profitable than Ethereum and other coins so Bitcoin should be our first priority and other will come next.
As for me, KuCoin is worth your attention. It is a pretty new token but the platform is cool, and it will grow further. Ontology, Stellar and OMG are also great.
Project that have a good progress, KuCoin after the exchange become so popular the coin itself gained value and will continue to have good support coming from the business, if for holding and investment type this coin can be one of those many good coins that falling for a while, read more and
research about your prospect coins, make sure that you are fully aware about the progress and future plans coming from the team behind.