I think it is obvious on its face that giving the players hard numbers from the statblock is more useful in a technical sense. If after a couple rounds of fighting you know that the monster only has 4 hp left, you are not going to smite, just as an easy example.
However, I think that is the least fun option available to the players and GM. there are lots of possible options between "hand them the statblock" and "tell them nothing" but all of them are better than handing them the statblock, IMO. (Note again that I am talking about what is fun, not what provides the most agency or the most tactical information.)