
Coway
Airmega AP-1512HH Mighty
Durable, effective for allergens/odors, but loud on high.
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I have four BlueAir units. I bought the first one in 2020, and they haven't stopped working a single day since. I live in Jakarta, and I have plenty of proof to verify their quality. Mine are ProL, ProM, Classic 402, and BluePure. I like to keep them oversized so I can keep them running at the lowest possible speed. I don't have much experience with other brands, but I think BlueAir units with quality certifications are a good buy. I have allergies and asthma.
We have been using Blue Air for over a decade and have been happy with them. Have the 411, the pure fan, and our first one the 400. Had a couple fan issues over the years but customer service has been good so far.
The Classic Blueair models with carbon filters work fabulously, yet I have only seen them priced as low as $300 when on clearance. You can still easily get filters for clearance models, though.
We use BlueAir Classic, they’re quite effective and are WiFi enabled. The companion app is sometimes frustrating to use but it’s outweighed by the fact that they have an API and can be automated. So I have the purifiers run a different speeds based on the values of our IKEA Vindstyrka.
The replacement filters cost too much and hold only 4ish months
I bought the shark never change as my first purifier just recently and I feel the difference with my allergies. The 5 year filter change really attracted me but after reading here a little more I might need to change it more frequently. I also tried the blue air for my office but didn't like it, I didn't feel any difference and it was noisy, I returned it and got the smaller shark never change .

Coway
Airmega AP-1512HH Mighty
Durable, effective for allergens/odors, but loud on high.

Levoit
Vital 200S-P
Smart, effective dust/odor; some find replacement filters pricey.

Winix
5500-2
Budget king, durable; poor VOC removal, Plasmawave disliked.

Coway
Airmega Mighty
Durable, great for allergies/dust, responsive auto-fan.

Winix
5510 & 5520
Good value, durable, effective for pets; carbon filter issues.

Ranked #1
IKEA - UPPÅTVIND

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CleanAirKits - Corsi-Rosenthal Box

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Austin Air - Healthmate Plus

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Winix - 5500-2

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Coway - Airmega 400

Ranked #1
Coway - Airmega AP-1512HH Mighty