For first-time visitors and families, Bhurban is the clear choice: accessible road, private villa accommodation at Himalaya Villas, Patriata Chairlift 3km away, and the full Galyat day-trip circuit (Nathia Gali 45min, Ayubia 40min, Abbottabad 90min) all accessible from the Bhurban base.
Nathia Gali suits serious trekkers who want the higher elevation base and are comfortable in guesthouses. Abbottabad is primarily a city — the Hazara capital and gateway to Mansehra, Balakot, and Naran rather than a destination in itself.