5

you know your getting some real facts when you hear the "generic china video display" music in the intro Ah yes the design differences?! as they have more to do with the 3/5 blade layout instead of the overall design?! lighting features? 5 blade have more? wut? 5 blade make more noise? is this not ofset by moving more air with less rpm? 5 blade is more is more complicated? lol wut its a goddam fan?! For the rest I admit I just zoned out its complete nonsense why am I even spending my time writing this

My 3 blades blow more air than my 5 ones. I think the engine is the main key.

She forgot the most obvious difference; the 5-blade has five blades and the 3-blade has only three. That's two blades more so the five's got to be better. However, 3 and 5 are both Fibonacci numbers so it's a draw in that comparison. If Fibonacci numbers are a deciding factor for you (and as important as anything mentioned in the video), I'd go with an eight blade. Yes, 8 is a Fibonacci number and also the number of legs that an arachnid has (Spiders are arachnids). That's a good point because no animal has either three or five legs unless you pull one or more of them off and I know you're thinking Starfish but they don't have legs. So I'd go with a 8-blade unless you can find a 13-blade fan. If you're still reading this it's obvious that numbers are important to you so you might as well consider that 3 and 5 are both Prime numbers while 8 is not. Also, 3, 5 and 8 are 11, 101 and 1000 respectfully in binary so that's quite a difference, for what it's worth.