If you're a Titan that loves Shoulder Charge, you'll value Strength more than most players. The usefulness of these stats depends on your build: if you're a Void Warlock using Contraverse Hold and Handheld Supernova, Discipline will work great.

Discipline and Strength: shortens the cooldown of your grenade and melee abilities, respectively.

It lets you play more aggressively by reducing downtime between engagements, and it's defensive in that it literally keeps you alive. For most this is the best stat in which to invest. The higher your Recovery, the faster you can safely re-engage after a gunfight.

Recovery: affects how quickly you regain health after taking damage.

As long as you have at least ten Resilience, you'll likely be fine. The time-to-kill values of the majority of weapons are unaffected, so even at higher levels, it doesn't do much. The effects are negligible in PvP, so you can all but ignore it.

Resilience: slightly increases maximum health.

You can also use exotics like the ST0MP-EE5 and Transversive Steps to boost your mobility further without relying on the stat itself. Mobility is great for strafing and should be one of your highest priorities.

Mobility: determines base movement speed (note: not sprint) and jump height.

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