Just study the company and their prospects for further growth, if everything is good with them, then the price of their coins will be high.
None other than complete study yes. When comes to coins, its market trend, market-cap and the volume sold out would define you of the best crypto currencies in the market.
When choosing best ICOs, check out, how long the firm exists in the business, how well their reputation is kept in the market and how well their achievement has been through out their business journey. I do choose tokens based on these studies.