For most resort skiers and snowboarders, dual-lens goggles with a standard anti-fog coating work just fine. The double-pane construction creates a thermal barrier that prevents most fogging, and the basic anti-fog treatment adds an extra layer of defense for typical days on the mountain.
Where you might run into trouble is during high-exertion activities—like hiking to fresh lines or skiing hard on warm, stormy days. The standard coating can struggle when you're sweating heavily or dealing with wet, humid snow. If you're a backcountry tourer or someone who skis in all conditions, the premium coating is worth the upgrade.
One important tip: never wipe the inside of your goggles, regardless of which coating you have. Doing so can damage the anti-fog treatment and leave you with foggy lenses for the rest of the season.