I was talking to my dad about intakes and my brother buts in telling me cold air intakes are worse than normal intakes, that I want warm air going into my engine.

Is this true?

 

no. but you don't want water possibly getting in there either.

 

Nor any dust particles.

 

Your brother is not very smart. You want cold dense air in your engine. Not warm air. I would go with a short ram intake because you dont have to worry about anything getting in there and plus the power differences are not that much different. Plus cold air intakes cost a lot more.