I’d think any NAS or Surveillance drive would be fine, but SSDs are the way to go for reads

Get an enterprise class hdd, externals aren’t meant to be ran 24/7. Any brand.

I used a 4 TB WD Green for 3 years of torrenting and no trouble. Now it's my security camera HDD as well as some other duplicate storage.

I've been using a refurbished enterprise drive from serverpartdeals.com for about a year and it's still going strong. Plus side: cheap. Downside: refurb.

Since it's torrents I assume it's not critical data, so it shouldn't be too big a deal if the drive fails. Buy two and put them in RAID0¹ if it's actually important.

¹ yeah yeah RAID is not a backup service

Seeding will wear out any HDD quickly. Use a SSD instead.

Sequential access is where HDDs shine.

Random access is where SSDs shine.

How storage do you need?

Look for enterprise or NAS grade drives. Really no matter which brand, just look for the best $/TB ratio.