Definitely the second one, there is no doubt in my mind that second one is more important about why I should invest into a coin, it is basically a much important version of the first one. This doesn't mean that price of a coin and the market trend of a coin is unimportant, that is very important for a coin and that is  what we care when the price goes up we get happy because we are richer and when it goes down we are upset because we lost money, so it is quite important.

But, I feel like the second one, the usefulness of a coin is a lot more important, we are in a situation where we try to make as much profit as we can from a coin but we buy that coin for a reason, why do we buy that coin? Because we believe in the project, why do we believe in that project? Because, that project needs to have a use-case, if it is a useless coin that means it is a worthless coin as well.