Fire red every time.
I quite like Morgan Furka Rouge metallic.
I do have a bias though. In y motoring time, I have owned (or had as a company car in one instance) a few blue cars:
Triumph Spitfire Mk3 - rear ended at M1 J23 by my quantum mechanics lecturer whilst I was a student & written off
Ford Orion 1.6D - clobbered by corrugated roof sheets on a windy day when parked at the stable yard by Mrs F.
Mercedes C200 Elegance - driven into on our drive by Mrs F.
I think I am perhaps best if I steer clear of owning a blue car ever again.