Did you know that a wider grip on pull-ups and pull downs actually works less of your lats than going narrower? Using a narrower grip will increase your range of motion, engage your lats more, and allow you to use more weight. All of these will yield better growth. Personally, the widest I ever go on pull-ups and pull downs is slightly outside shoulder width like I’m doing here. For pull downs, I actually prefer the narrow V attachment instead of the one I’m using here although this is a standard attachment found in just about every gym.
Two other common mistakes people make when doing lat pulldowns is leaning too far back/using momentum and the opposite which is sitting too upright while failing to lean back at all. Instead, you want to lean back slightly, retract your scapula, stick your chest up, and pull to around your upper chest while making sure you are pulling with your elbows.