Is Resigning Worth It?

Some people like to resign in chess games, including grandmasters, but why is that? There's a chance you could get stalemated, or possibly win. In the game, Darga-Lengyel 1964(you can see the ending position at the bottom), white resigned in a winning position. In my opinion, I like to play it out until I win. Post a comment supporting or arguing with me. Thx