When deciding in which coin to invest you can either blindly follow suggestions by others or make your own informed descision based on some criteria:

• What problem does the project attempt to solve?
• Is it a solution looking for a problem?
• Is there active development behind the project? (check Github activity)
• Has the team produced anything but a whitepaper?
• Are there established competitors which are much further into delivering a working product?
• Cross reference developers against previous scam projects
• Current market capitalization of the coin