Wraith

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The Wraith is the Covenants main battle tank. Its heavy armour makes it extremely difficult to destroy. But this toughness comes at a heavy price; because of the sheer weight its very slow.

A Wraith is armed with a plasma mortar of great destructive power, this is achieved by lobbing huge balls of plasma high into the air. It also hovers above the ground, and is quite maneuverable. As a player vehicle, while slow, the Wraith is highly maneuverable and is piloted as easily as the UNSC Scorpion. Unlike the Scorpion however, as a hover vehicle you can strafe, which is highly useful when fighting other Wraith or enemies with slow mortar projectiles.

A second player can hop in the turret for up close protection. The Wraith's weak spot is its' engine; which is located at the back of the Wraith. Meleeing the back armor plates and placing a few grenades inside the motor will cause sufficient damage to destroy this heavy vehicle.

Comparison of Convenant Wraith and UNSC Scorpion

Comparisons between the Wraith and Scorpion are inevitable, since the two are the heavy artillery tanks of either side.

Similarities

Both are easily piloted and very easy to control
Both are slow and can be victims of missiles and other anti tank weaponry
Both sport very powerful weapons that do massive damage to enemies, and can destroy smaller vehicles with a single shot.
Both have splash damage on their weapons

Differences

The Wraith is a hover vehicle, and can strafe from side to side, while the Scorpion must turn its body in order to move side to side. This gives the Wraith an edge in maneuverability
The Wraith has a forward fixed firing energy mortar, while the Scorpion's turret rotates 360° in any direction (and can rotate continuously in a single direction).
The while both tanks can aim higher or lower, the Wraith's energy mortar fires in a slow arc, while the Scorpion's artillery shell fires straight and arrives at its target nearly instantaneously. This means that while the two may have a similar rate of fire, the Scorpion will land its barrage of shots sooner than the Wraith, and is also far more effective against air units and units at a distance.
The Wraith's Energy Mortar appears to have a larger splash area effect when it lands.
The Wraith's energy mortar's speed and high arc travel makes it very difficult to target long distance targets, as you must experiment to have your attack land on the enemy. Its mortars are also easily avoided by enemies in the distance.
In Campaign mode, the Scorpion can transport up to 4 troops who sit on either side of the tank, the Wraith can only transport a co-gunnery player, and no Covenant seem to want to do this in the single player campaign. Therefore, the other Covenant in your party are prone to being run over or fall victim to splash damage from your own mortar canon.

For many of the above reasons, the Scorpion is actually the superior vehicle.