IQAir HyperHEPA is substantially worse than the AirFanta 3Pro. The 3Pro gives you about 10x more clean air per dollar (2 CFM/$ vs 0.2 CFM/$), and 2.5x more clean air at a given noise level (45dBA: 213 vs 86 CFM).

I agree big fans moving slowly is better all else equal, and something AirFanta-like that used a 12" fan could be even better.