At the end of the day, someone will come here to show you how EOS will be big, that it was created buy the creator of Bitshares and Steem etc....another one will come here to say that ADA will be huge because they want to implement a secure PoS algorithm, sidechains etc...
In my humble opinion only you can make this decision by reading whitepapers and documentatios carefully, research the team, the idea, the potential, it will take several hours but it's your best option
In order to lessen the confusion on selecting a better coin between ADA and EOS, buy both of the token. See the difference upon these two coins when it comes in growth and development as well as the utilization of the coin. More over, we should not be depended among the comment and suggestions instead try to look the difference of the coins we want to buy so that at the end we will not blame other people.