I think 24 TB was supposed to be maximum recommended space, not maximum space but in any case there’s no indication of benefit of such large nodes for now.
Demand data is not yet available as we are only about to enter production now. You should have a better idea over the coming months.
If you are asking whether to expand the current node or start another node on the same address, the more nodes, the less the risk in case of some kind of hardware failure, so I would suggest multiple nodes if you ever run into capacity bottlenecks. In case you’re running some kind of fault tolerant storage system, I would say it’s about the same, I suspect Internet connection is the weakest link there.