Size and weight
GaN's clearest win. Higher switching frequency shrinks the transformer, and lower losses shrink the heatsinking, so at 45W and above a GaN charger is dramatically smaller than a silicon equivalent. At 20W the gap narrows to a modest cube difference - which is why budget 20W programs can still be silicon without embarrassing anyone. The manufacturer's mini series is sold on exactly this axis: its own titles call the 20W and 25W models “small size”.
Heat and efficiency
GaN wastes less energy in switching, so less heat is generated at the same output. The manufacturer's FAQ states figures of up to 95% efficiency and 30% less energy loss for its GaN chargers versus silicon - a company statement, quoted here with attribution, and broadly consistent with what the physics predicts. Sustained full-load behaviour still depends on enclosure design; verify on samples under your market's ambient conditions.
Cost
GaN transistors cost more than silicon ones, and the gap shows in unit price, narrowing every year. The commercial logic: GaN earns its premium where size is the product (travel, mini, multi-port high-wattage) and struggles to justify it where the charger disappears into a bundle box. That is why this manufacturer's catalogue keeps both worlds - a GaN line to 100W and a fast charger value line for price-led programs.
The verdict by tier
- 20W phone tier: either technology; decide on price and size target.
- 30-45W: GaN pulls ahead on size; silicon remains the budget route.
- 65W and above: GaN is effectively the category standard for retail.
- Multi-port: GaN, because heat density decides the design.
Background first if you need it: what is a GaN charger. Then the wattage ladder: the wattage selection guide.