They are very different types of weapons. The NLAW's range is inferior at a basic level and the missile itself does not actually track the target making shots o

They are very different types of weapons. The NLAW's range is inferior at a basic level and the missile itself does not actually track the target making shots out to the edge of it's theoretical range very difficult, unlike the Javelin. While both Javelin and NLAW are top attack munitions, their flight trajectories are very different. The NLAW flies more or less in a line from launch to directly above the target and then detonates its shaped charge warhead which shoots down as the missile flies over (i.e it explodes down, not forward). Its flight trajectory is more vulnerable to active protection systems compared to the Javelin's true top attack mode (but that's not an issue against Russians). The warhead is also smaller and less effective. The NLAW is a great weapon but its constraints are apparent in many cases.