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

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I love my Levoit Vital 100S-P! It's totally fixed indoor allergen issues for me
I did a lot of research, and recently bought 2 levoit 100s-p for bedrooms. very happy with them, they're super quiet (kids rooms), and the spikes i see for air quality in the app I've self triggered are accurate. im very happy I decided to go for levoit (over winix coway and blue air were my contenders). I also looked a lot into hepa filters etc with levoits lawsuit from Dyson. Just because they pulled the hepa cert doesn't mean they arent as good if not superior (a quick search on this sub will confirm). they are also peletized which I found in ymresearch to be superior to some carbon hepa filters. edit to add, I was strictly against an ionizer. I know if controversial on this sub, but im team against.
I bought the Levoit Vital 100S-P for my daughter to use in a college dorm. It is quiet and works well. Go watch videos comparing the noise level between Levoit Vital 100s-p and Levoit Core 300-p. I bought my air purifier from Walmart.
I have a Q and I use the Levoit air cleaners. They work great, some even have apps ( neat addition but certainly not needed) super easy to clean and fairly quiet. One model is even a box, that can go against walls or furniture, if space is a concern. I also buy generic filters for them, compared to paying tao fines as much for the name brand. About ever 2-3 weeks, I even wipe off the filters, to extend there life a little more. It is insane and even kinda gross how much “stuff” those filters take out if the air in a week or two! I don’t deal with much dust in my house now either. I swear by good air cleaners! This is the one I spoke of above that can go against a wall, curtains or furniture. https://a.co/d/bATDubu They have many others too that are smaller and cheaper. This is the small cylinder one I have, it was my first. Works great, nothing fancy no apps. I keep this in the den. https://a.co/d/0AeZxvt Whatever you decide on, just. Reminder to not have it close on your birds cage. You don’t want any the bird to feel any breeze or draft at anytime, ever. And regular cleaning is a must! Good luck! Best wishes to you and your Q too!
Mine are Levoit and I am super pleased with this brand.
I have several models of Levoit and I love them. They work so well. The generic filters I found on Amazon work great too, at half the price. I like to wipe my filters off monthly, or even biweekly if possible. It makes the filters last longer and I just feel it helps to keep the air cleaner. I have the round filters and the square one. I like the square one the best as filters are cheaper and you can put it against a wall or furniture and it is ok. Good luck!!
I recently purchased a Levoit Vital 100S-P for our bedroom and my husband has commented he thinks it's helping his sneezing. (We have 4 cats). I'm too new to the air purifier world to know what filter replacement costs look like or other purifier options. I do like the app controls for the Levoit and that it sends me messages to vacuum the filter or senses "bad air" and recommends turning it on.
I have mine set to "pet" mode. I notice that when it first turns on it is pretty noticeable. After about 10-15 minutes it quiets down to not very noticeable at all, especially if there is other noise is in the house, TV, music, talking, etc. Even when "loud" I don't find the noise disruptive at all - very white noise, sounds like a regular old fan, for me. There are "night/sleep" modes that are supposed to be quiet during sleeping hours but I haven't tried them out. My husband is a pretty light sleeper and I don't see the need to run it overnight in our bedroom and chance any disruption. I have all of mine set on a schedule to run a few times throughout the day. For the one in our bedroom I have it run for an hour before bedtime so it's all finished up by the time we get to the room and another hour right after we're waking up. I also like the app feature to turn off and on - if I'm cooking in the kitchen and there is lots of odors I can just turn on the one in the living area and set a timer for it to run an hour or so. (And I have had the app push me a message while cooking and say "living area detecting poor air quality...").
I have a Levoit 100S-P with the Toxin Absorber filter. It works well in keeping the air in my office relatively odor free. However I am also very rarely in the room during a print, as I do most printing later in the evening / overnight.

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.

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Coway - Airmega AP-1512HH Mighty