Are you staying here permanently/migrating? If so, dito ka na lang bumili. Maganda yung warranty dito bec of consumer protection. Most gadgets can be replaced/repaired beyond 2 yrs after purchase date.
Kung mura, can't answer that di ko alam ang presyuhan ng gadgets sa pinas. Kung computer parts, ang gilmore dito eh yung msy at umart; another is camera whse or yung mga galing ng HK for cameras (duh) or drones. Ebay au also does 20% off sale sa mga gadgets from time to time. Amazon au is ok pag may sale.
Electricity plug din ang issue if you're buying in ph vs au. Extra cost din sau kung bibili ka pa ng mga converters.
Lastly, peso to au dollar conversion fees plus credit card international fees if you're gonna purchase from overseas.