I’ve fiddled around with both Zotero and Bookends, but haven’t fully embraced either. I don’t think I’d use Zotero for my TBR list, though. First of all, I’m very intentional about what goes on the list and how it’s organized. Secondly, a book or article’s TBR entry always points to a note where I collect additional information about the book, e.g., reviews, who recommended it & why, any thoughts I might have about why I should read it or how it fits in with other things I’m reading, watching, or seeing, etc. I don’t think I could do either of these things easily or well in Zotero.
I detailed my TBR workflow in this post, if you’re interested.