You need to consider the thermal, mechanical, electrical, and chemical properties of materials to choose the right fit for your application.

Thermally, you need to factor in the temperature durability of the components and the distribution of optimum functioning temperatures. Additionally, you should think of mechanical properties, like enclosure and form factor control, and the density, in the case of High frequency PCB.

Electrical properties matter most when you need to balance the dielectric requirements such as impedance, signal quality, and resistances. Chemical factors like moisture absorption (prevalent in electronics functioning in agricultural IoT) and flammability are also essential for the proper performance of your High frequency PCB  products.