The Code.
if you can read the code and understand it then there is nothing else that matters. just go to their Github repo and start reading the code and see what is it that they are exactly offering and claim it to be new.
and then check to see if these features are really implemented properly or not.
but if you are looking for profit (like the rest of us) then all of that is pointless because no amount of good code, features, developers, white paper, etc can compete with pump and dumps and the profit earned from them. look at ETH and you'll see what i mean, a coin with a bad code but a good profit only when it is being pumped