I have stayed with box speakers which I have as floor standers for serious listening and bookshelfs for more casual locations.
Over the years, I have been intrigued by both planars and horns for their reputedly better performance in certain aspects. But I didn't go with the planars because of their size, volume restrictions, and bass output. And I didn't choose horns because of their size, WAF impact, and high frequency extension. I recognize these concerns are mainly my personal prejudice, and I could be wrong about performance issues.
I wish I had had more time and money to actually explore these.