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