Christine

• Allies: Arnie
• Weapon of Choice: She's a car. Guess.
• Enemies: Anyone that messes with Arnie.
• Weakness: Arnie.
• Strengths: Regeneration.
• Movies: 1. Christine.

The Happy Toyz Truck

• Allies: Other machinery and automobiles.
• Weapon of Choice: Again. guess.
• Enemies: Any and all humans.
• Weakness: Need for gasoline, and explosions.
• Strengths: It can turn pedestrians into blood puddles in seconds.
• Movies: 1. Maximun Overdrive.

Winner:

• Both are automobiles that can control themselves. Christine can regenerate, but Happy is a huge-ass diesel truck. I think that size and power would prevail and The Happy Toyz Truck would win.