difference between mediator and OSB

Mediator:

• Tiny, Light weight Service Bus
•  Used for VETRO Pattern (Validate, Enrich, Transform, Routing, Operate)
•  Value mapping and cross reference for supporting Canonical Data Model
•  Message Transformation with XSLT
•  Part of SCA.(Service Component Architecture)

SOA Service BUS:

• Large powerful service bus.
•  Great for Enterprise wide integration
•  Message Transformation with XSLT  and XQUERY
•  Not Integrated with SCA