Better match. The overall quality of care ( and caring) is primary but specialty units often have staff with better trading and experience working with these conditions which adds to the quality of care.
Maximizing function . Specialized memory care is set up to help people with dementia be the most functional that they can be. The idea is to compensate for someone's impairments by predictable schedules, a peer group, and easy availability of assistance with adequate supervision for safety. Look for a place that will work for someone with brain problems, not for a place that would have worked for the person before that.