Standalone HANA Vs BW on HANA

Hi HANA Experts,

I am newbie working on my first HANA POC. 

We are having following system in client landscape:

1. SAP ERP
2. SAS
3. SQL Server
4. BODS as ETL
5. XYZ applications
6. No SLT licencing

We want analytics to do on HANA, data will be coming from all this servers

What will be best way to get data in SAP HANA system:

1. BW on HANA

2. Standalone HANA

What are the pros and cons for implementing of above architecture?

want a good disucussion here to understand what will be good in what aspects...