I can tell you this, it's not a great idea to run torrents on ZFS due to COW, you'll get write amplification due to all the little updates all over the place.
Download your torrent onto a "standard" native filesystem such as ext4 or XFS, and then move the downloaded file over to ZFS when it's done downloading. And turn off "atime" on the ZFS dataset if you're uploading/seeding (although that's a good idea anyway)
https://github.com/tteck/Proxmox/discussions/1416