Comment by clairity

i literally ran into this with wirecutter when searching for an air purifier years ago. they recommended an inferior performing coway when their own tests concluded that blueair (211+) was significantly better. they've long since removed the chart showing this discrepancy, and they still recommend coway, no doubt because that's their affiliate partner. i bought the 211+ and have been mostly satisfied with it for my studio apartment, but beware, filters are relatively expensive.

in any case, if you really care about effective air purification, buy the largest/most powerful fan you can get (CADR tries to proxy this, but is an imperfect measure), because the critical factor is getting as much of the air volume through the filters before the dust settles (literally). filter effectiveness isn't nearly as critical as throughput.

nowadays i'd probably opt for two of the ikeas instead, and put them on opposite sides of the room (but not against a wall). that'd be cheaper and likely just as effective.