>>314220354
Index Cons:

Price
No ability to swap batteries in the controllers.
The headset is hot and less comfortable.
Once it is setup it is not really mobile.
Index reliability issues.
Long Wait to actually get the headset.

Rift S Cons:

Poor Audio

Image quality is not bad due to the good lenses, but it is not as good as the index.
Inside out tracking.
No out of the box FBT supports
New users need to link thier Facebook account to use it.
Controllers don't stay in your hands, requiring you to constantly hold them.
Rift S vs Valve Index