I wasn't finished yet lol
Who is Sony's biggest competitor?
Who is Nintendo's biggest Competitor?
Who is Microsoft's biggest competitor?
Who is Valve's biggest Competitor?
Is Apple a competitor? If so who is Apple's Biggest Competitor?
EDIT: My list
Sony vs MSFT/ Sony vs Samsung outside of gaming
MSFT vs Apple/ Games - MSFT vs Sony
Nintendo vs Apple in handhelds
Valve vs EA Origin
Apple vs MSFT, Nintendo, (Google)Android