Gartner Magic Quadrants are based on product research, interactive briefings with vendors, web based survey of customers, Gartner customer enquiries, market share estimates.
When evaluating a Data Integration Suite Gartner looks at connectivity, modes of interaction (CDC, bulk event), data transformation capabilities, metadata and modelling, design and development, data governance, deployment options, operations and administration, architecture, service enablement.
Since I work for IBM InfoSphere so I am focusing on IBM strengths.
- Breadth of Functionality: ETL, CDC, propagation, data replication, federation, virtualization are all listed.
- Installed base and diversity of usage, often cited as the enterprise standard for data integration.
- Alignment with EIM trends: on the cutting edge of metadata management, Hadoop support, self service data preparation and deeper cloud support.
For more details you can read Magic Quadrant for Data Integration Tools.