It's hard to find good information on filtering efficiency for cabin filters.
If actual filtering ability is important to you, then you should see if you can cut up a regular 1 inch home filter into the size you need.
Choosing from a selection of home filters gives you better knowledge on what the actual level of filtering is.
Most filters will filter pollen though. That's quite a basic level of filtration.
What I look for now is charcoal because that removes VOCs including smells. These are the contaminants that you really want filtered when driving. So you could look for custom made cabin filters with charcoal or cut up the one or two home ones that contain charcoal (sometimes labelled for pet use). Note that these often have basic pollen filtering and no choice of really efficient filtering like some of the non charcoal ones