S&OP on HANA covers multi-level BOM, multi-level locations, resources, co-products, lot-sizes, lead times, etc. similar to SNP with heuristics and optimization. SNP has real time data integration with ECC while S&OP loads are at some frequency (e.g. daily). SNP also currently gets a plus for order level information. S&OP has advantages since it also includes demand and finance aspects in one real-time model with flexible aggregation and dis-aggregation. S&OP also has a modern easy to use Web and Excel user interface and can optimize for profit (in addition to cost).
You can see some of these aspects here: SAP SOP - YouTube