Hatari is good because it is one of the very few brands where you can easily get replacement filters.
Xiaomi is another one.
It is very difficult, to say the least, to get replacement filters for the Japanese brands. In a thread from the time PM 2.5 started, like 5 or 6 years ago, somebody posted his experiences looking for replacement filters for, I think it was Sharp. You don't want to go through the same ordeal.