Powder baskets are those oversized discs (80-100mm+) near the pole tip, and they're designed to keep your pole from punching through deep snow. If you regularly ski powder, backcountry, or off-piste terrain, they're pretty much essential—without them, your pole can sink right up to the grip, leaving you with no stable plant when you need it most.
That said, if you spend most of your time on groomed runs and hardpack, powder baskets can actually work against you. They add weight, create more drag, and can feel clunky and cumbersome when you're making quick pole plants on firm snow. Standard baskets (40-50mm) are the better choice for on-piste skiing.
The bottom line: if deep snow is a regular part of your day, powder baskets are worth it. If you're mostly cruising groomers, stick with standard.