Chemistries have varying material densities so such a space (volume) choice depends upon the chemistry. Once battery volume is fixed (based on many other car design considerations), then the amount of storage is fixed for that chemistry. One generally does not place another chemistry in the same volume and look at tradeoffs. If you change the chemistry, you must go back to the earlier step and evaluate how much battery volume you want to now have for that new battery chemistry. At this point that for the same weight it’s safe to say Li-S is four-times better than Li-Ion chemistry.