[Question] Biomedical Research Models: Mice vs Man?

My wife and I are about to choose what to do on our M.A. theses. Both of us are considering research of Alzheimer’s disease, Aging & Cognitive Dissonance - Either on humans (Imaging or Cognitive tests) or mice (Imaging and the use of other “wet” techniques—which many of regrettably include the death of mice).

Currently, we don’t assign much value to the life of mice as test subjects when weighted against with a possible improvement of a Human’s Condition.

We do, however, wonder which of the two is more beneficial.
So: Any ideas whether Bio&Medical Research is more effective using Animal Models (not necessarily limited to mice) vs Humans?