I don't think looking for larger or more blades is the best way to choose the fan to buy. If the motor on the one with the largest and most blades is lacking on power, it might get dragged down in speed more. Possible for a fan with a more powerful motor to out flow another even if it has less blade area. The only way to do it accurately would be to buy them all and test them against each other. Same with a sharper angle. Blade design, motor speed and power should be engineered together for the best performance and efficiency.
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