Hedgehog versus Squid anti-submarine weapons

Why choose Hedgehog or Squid, and could Hedgehog damage a submarine without sinking it?

Hedgehog could damage a target but normally required contact, whereas Squid used a heavier charge with a useful lethal area.

Hedgehog throws more projectiles, but its relatively small bombs normally need to strike the submarine hull to detonate decisively. A miss therefore produces little effect, and even a hit might damage rather than immediately sink the target. Squid carries a heavier charge whose underwater blast can be lethal without direct contact. It continued a development line that moved beyond the weak early-war Fleet Air Arm anti-submarine bomb toward a weapon with a useful kill zone.