LSA++ is more flexible and has more ways of achieving objectives in BW systems than LSA.
The Advanced DSO can be used to start queries directly on the data propagation layer. Explicit reporting layer (Infocubes) are not needed.
Virtual data marts can be defined using Composite Providers that combine InfoProviders.
The data in HANA databased can be accessed directly also using Open ODS views and queries can be performed on same.
Master data is stored in Infoobjects same as it was in LSA
Advanced dso is used for data persistance.
As the datawarehouse grows in size, there is more and more historical data which is lesser queried. To have cost effective plan in long term, it is highly advised to have data aging strategy.