Good summary / comparison of the three. I’ve used ITIL for 11 years and I’m fully qualified in ITIL Service Manager’s Expert V3 - ie all the stuff in the diagram above! I'm also a member of the IT Service Manager's Forum (itSMF). I’ve always understood that ITIL was a framework that should be adapted to meet the needs of the services. I think that’s exactly what FITS have done, and they’ve done it exceptionally well. Fundamentally, the FITS terminology is very similar to ITIL so you could have an equal discussion with your peers in business.
Couple of small points:
1. FITS Practitioner also covers Security and Patch Management
2. Operations Management (in the Advanced/ Manager’s course) encompasses:- availability & capacity as well as sytems administration, storage management, directory services administration, print & output management, performance & monitoring, preventative maintenance, service continuity and energy conservation.
Finally, the FITS courses include group exercises which show you how to apply FITS when you get back to your school/ college/ uni base. ITIL don't do that so I rate that as a significant advantage for FITS.
PS. well done and good luck to the new FITS practitioners in Barrow-in Furness and Macclesfield - remember, small steps!