The licence behind the price: DHA, DoH and MOHAP tiers
The licence tier matters as much as the licence itself. A registered nurse has passed regulator exams and can legally handle medication administration, wound care, catheters and injections under a doctor's orders. An assistant nurse or licensed caregiver works at a lower tier — personal care, mobility, feeding, basic vitals — at a correspondingly lower rate. When two quotes differ by AED 300–500 per shift, the first thing to check is whether they are quoting the same tier at all.
Verification takes minutes and is free. In Dubai you can check any professional's licence number on the DHA's Sheryan portal; Abu Dhabi and MOHAP offer equivalent lookups. Ask for the licence number before you pay anything. A provider that hesitates to share it has answered your question.