Well, bitcoin would be the best coin in the future because it is the most established coin. But if you mean ALT coin, there were coins you can trust like etherium, LiteCoin and waves. In my case, I see potential of the coin for the future is its purpose and reason why it is created. Coins must have purpose uniquely different from other coins because this we can determine what track it is going.
Another thing I consider is its people who are engage with it. There were people you can look at at this campaign, are they credible or well known. In the future many coin will crash and only those who have really a vision and mission would remain.