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Changeable filter types are good. Since you want to purify the air, you do not need one of those cheapies that sell with the argument "no filter change needed", because that will only mean you more or less circulate the air. Either washable filter of some kind of plastic or changeable HEPA filters. It is somewhat more work with dealing with filter washes or changes, but you certainly get better effect!
You might also want some features like timer. So you can set it to start a few hours before bedtime and then go off before you fall asleep.
Another feature is moving outblow. So that all purified air isn't blown out straight ahead. It's better if it's spread in the room with the help of a moving outblow unit.
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The truth is not affected by the beliefs, or doubts, of the majority.
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