Mind Mapping Complex Data
If "keep control" means the organisation and managing of the data to be displayed, yes Mind-Mapping (MM) is suitable.
However Meta Planning will be easier for initial layout. (Cards pinned to large sheets of paper on pin-boards - more easily moved until fully arranged - then stuck to the backing paper to retain / display). Can be layed out in MM format. Photo or Copy as mind-map - User requirement /branch, from these Software then Testing branches. Different colour per type.
Or each user requirement becomes the "title" from which stems the software then scenario branches. Need inter-map linkages (as in project mapping) to show connections.
Will need to cross-reference to linear writing for data that cannot be mind-mapped and/or other MMs for detail.
Could combine mind- and process-mapping (with images etc.) as the way to fully cover and display the data. (This is what evolved when I mapped the process for building a telephone exchange - linked to the process for a person receiving a phone).