-space (laptops take up less physical room, and can bet locked in a closet, etc)
-onboard UPS, its nice when the power goes off, to have users with laptops still able to be productive/not have lost what they were working on
-service, I find it much nicer to be able to have a laptop dropped off or pick one up to work on it. If you are lucky enough to have a loaner machine of the same model, temp swapping is easier (more work with a desktop)
-the user can lower their screen (on their own, as directed by an instructor) to concentrate on the presentation.
-if an employee is able to work from home with the laptop, significant benefit to the school (and potentially the employee)
this alone can negate the difference in initial cost. Many employees also enjoy the option of working from home.
-retained value, a 4 year old laptop is of some use (could be repurposed, could be sold) an 8 year old desktop is a boat anchor.
$650 v $900 are the numbers I use, ($750 with an LCD that can be reused for several generations).
the desktop will always be faster (from day1 to year8)
-cheaper consumable parts (no batt, cheaper drives)
-I am curious as to your mention of imaging. Imaging costs should be the same (equivalent) regardless of case type/form factor. Perhaps what you mean is, if you have 90% laptops, what costs can you save by turning those last 10% of desktop into laptops? And being able to manage 1 less image?
interested to hear what others will add.
--replacement cycle (this one is a tricky one what is the cost/benefit of a laptop vs desktop) i.e. a laptop for 4 years at $200 a year that is used 20 hours a week vs. a desktop for 8 years at $100 a year that is used 10 hours a week