You have to look quite carefully because "HEPA" became branding rather than rating, and you can find it labelled on filter appliances which vary in capture rates by several orders of magnitude.

You want ones with numbers, 99.97% is a good number to find, you can get it on big Honeywell filters.

While incredibly difficult to find, there are MPR 2800 rated furnace filters which are better than HEPA.

If I were you I’d sign up for Consumer reports and buy their second highest rated air filtration product. The most expensive one tends to be really expensive and the second best tends to be almost as good at a significant discount. This is how I make most large purchases these days.

I got a cheap tower Holmes from Walmart for not that much (less than $100) and I put 2 99.99% filtration HEPA filters in it and have been running at half speed most of the day for over a year.

I shake out the pre-filter (gets covered in dust and pet dander) and toss out the filters every ~6 months. I use a filtrate 1900 filter for the home air filter.

Tip: never use the "ionic" button. They come on most filters for some bizarre reason, but ionically charging the air is a bad idea.

Getting a filter that is properly sized for your space and that meets your unique requirements (ACH, efficiency, etc) is likely sufficient.

Here’s an outline on how to go from the common rating, CADR, to various parameters that are of interest:

https://frdmtoplay.com/nagivating-air-purification/

In terms of bang for buck nothing comes remotely close to having a furnace filter strapped to a 20" box fan. This gets you most of the benefits of an expensive filter for a fraction of the price.

People will talk about CADR but also look at TCO.

Dyson