Arachnids vs. Protoss

Arachnids: The Arachnid's monstrous appearance belies their cunning. They are conquerors bent on destroying all other species with an army of engineered evolutionary horrors. Many times have the forces of man been besieged by these creatures, and they are not always victorious. Whether bursting from the ground with some great leviathan-esque horror, or managing to sneak right past our defenses only to burst from within our own ranks, these creatures are as tricky as they are deadly.

Protoss: The Protoss are a sapient humanoid race native to Aiur. Their advanced technology complements and enhances their psionic mastery. Protoss culture is built around core philosophies that have been rigidly adhered to for over a millennium. As such, it is difficult for their society to adapt to changing circumstances. The main protoss cultural groups are the Khalai, who adhere to the communal Khala, and the Nerazim, who reject the Khala.

Now these two armies are about to collide. Will the genetic horrors of the Arachnids spell doom for the Protoss? Or will the psionic power of the children of Aiur hurl these monsters back into the abyss? Only time will tell, as both armies gear themselves up for all out war. In the end, only one can survive? But who will it be...

WHO! IS! DEADLIEST!

*(Because I know this will pop up if I say nothing: No space battles. Planet-side only.)

(Disclaimer: Just to be clear, these two combatants were created / are owned by people far more creative / wealthier then me. I have made this, not for profit, but in the hopes of encouraging spirited discussion among fans. Please support the combatants official series. Thank you, that is all).