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

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Austin Healthmate Jr. Worth the investment.
Have a Austin Jr for years, great but not cheap. Recently bought a Levoit Vital 200S-P for another part of the house, very good right out of the box...very happy with the purchase.
You can't really compare the two. The Austin HealthMate Plus Jr. CADR isn't published, but it's believed to be about 120 CFM, lower than the Levoit 300. But it has at least 6.5 lbs of Activated Carbon, Potassium Iodide Impregnated Carbon and Zeolite. It's much more than a particle filter, it's "designed for the chemically sensitive (MCS), removing the toughest contaminants and broadest spectrum of VOCs" and is "also recommended for allergy and asthma sufferers sensitive to VOCs, or for those in high smoke, particle or gas contamination areas." As with any unit with sorbent media, you want to run it on low to maximize "dwell" time, so the CADR will be a tiny fraction of 120 CFM. The odor reduction is a function of the meaningful amounts of carbon. With the Levoit, even if you upgrade to the Levoit Core 300-P 4-Stage Smoke Remover Replacement Filters, you get a trivial amount of carbon in a mesh. The reduction in allergy symptoms would suggest that you are more allergic do things that are captured by the "Activated Carbon, Potassium Iodide Impregnated Carbon and Zeolite" rather than by the particulate/HEPA filter(s).
I love my Austin air. I have a Jr with HEPA and it’s so quiet.
We have the Healthate too (for eight years) and have had to replace the filter once while running it 24/7. The filter is expensive, but it’s incredibly effective and obviously long lasting. The machine is also very simple, so it will last. Just a simple fan and a knob to control the speed.
I can name two! The AustinAir HEPAs are basically a big metal box with a motor. The plastic in it is the squirrel cage fan itself and maybe the speed dial cover? Same for the SmarterHEPA (outside the US Smart Air) Blast and Blast Mini models. They again are a big metal box with close to zero plastic outside the fan itself. Of course even the motor will have plastic covering the wires or things like that. And the power cord has a plastic coating so nothing these days will be 100% plastic free but these two models are very close. Also both of them are really great HEPA filters! Basically no ‘features’ to either, just a big box with a fan and a speed dial. I had the AustinAir for like 30 years running 24/7.

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