When it comes to Omnisphere 3 and it's hardware integration, not all controllers are born equal. Some have as few as 4 configurable knobs whereas others have 16+. Considering that the hardware assignment is just a bunch of midi CC# mappings, and that many of these controllers can have their buttons remapped (often via software).
This table is meant to help people get the most out of the hardware integration, more than what Spectrasonics claims to offer. Just manually remap the midi CC buttons/knobs/faders on your keyboard so it matches one on this list that has more functionalities/mapped parameters than yours ;)
This originally started when I noticed my Komplete Kontrol S88 MK2 only had 8 knob assignments in the Omnisphere Guide when the actual keyboard also has 8 buttons and allows for 4 pages (thats a total of 32 knobs and buttons). Since every button and knob is programmable, I could feasibly make the keyboard impersonate another keyboard for which Spectrasonics had better support. The last step was then finding which keyboard had the best support for my usecase by finding which had the most pre-assigned knobs,buttons, and faders for Omnisphere 3.
This list was very long so I used scripts to scrape the knob counts. If I made a mistake, feel free to let me know :)