>>286918561
The index is a nicer headset for sure, especially if you're not in the ideal IPD range for rift S. The knuckles controllers are definitely worse though. The finger tracking is an unreliable gimmick, not futureproof at all. The base stations don't need USB ports though, just wall power. Lighthouse tracking is pretty good overall.

It's probably worth the upgrade for yourself if you can actually get one, but I wouldn't sell your rift S until you have one shipped. You can at least play VR games in the meantime.