Last Epoch is currently not offering a lot of content to do right now, D4 on the other hand is offering a ton of content to do at release, and last epoch is still getting monetization, D4 is not granting any power whatsoever in its premium battle pass, its all cosmetic rewards, Last Epoch is a 40 dollar game because it offers far less content, as soon as Last Epoch releases that price is going up, D4 has far more content than LE so its worth the money to buy the game.
So currently last epoch is losing in terms of available content, and its still got a long time before its official release while D4 is almost releasing.