I haven't seen Silo yet (soon!), but Severance was amazing, and very unique. For All Mankind is great, too. And I know people have mixed feelings about Foundation, with all the changes from the source material, but I enjoyed that, as well.
One thing I like about Apple TV's shows is that they don't seem to be afraid to try new directions - Severance is a great example of this. As is Servant - I didn't enjoy that one, but it was certainly different! While other streaming services appear to be primarily focussed on the next big media property they can adapt (The Witcher, Wheel of Time, Rings of Power), Apple seem to be a bit more willing to think outside the box.