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Generally you want low inductance so a large surface area is desierable. Multiple small vias typically will work better than 1 large via since the total surface area will be greater.
Depending the PCB track/trace you are using. You use vias that are large enough for many reasons:
1. For thru-hole components, if you use any.
2. Mainly connecting top to bottom sides of the PCB. Then if it is power and ground, then these vias are usually large ones with inner diameter (30/40mil) and outer diameter (80mil). If it is signal via, inner diameter (30/40mil), outer diameter (50mil). The larger the vias, the greater the parasitic capacitors between top and bottom via pads, but lower resistance, thus favour power and ground. These parasitic capacitors are inherent decoupling capacitors, which smooth fluctuation in supply rails, as well as providing a return path for non-ideal return current.
Depending the PCB track/trace you are using. You use vias that are large enough for many reasons:
1. For thru-hole components, if you use any.
2. Mainly connecting top to bottom sides of the PCB. Then if it is power and ground, then these vias are usually large ones with inner diameter (30/40mil) and outer diameter (80mil). If it is signal via, inner diameter (30/40mil), outer diameter (50mil). The larger the vias, the greater the parasitic capacitors between top and bottom via pads, but lower resistance, thus favour power and ground. These parasitic capacitors are inherent decoupling capacitors, which smooth fluctuation in supply rails, as well as providing a return path for non-ideal return current.
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