What's the best approach to purify the air indoors during the winter?

During the winter months, it’s too cold to keep my window open. As a result, the indoor air can get pretty stuffy. What’s the best way to purify the air? I was thinking of getting an air purifier, but am not sure what’s a good brand. Also, which is better the ionic kind or filtered? As an alternative, how about just having several indoor plants? Would that do just as good of a job as I’ve read that plant purify the air naturally. Thanks for your answers.