Removable insulated ear pads are the most versatile option, and for most skiers, they're the smartest choice. The thick, insulated pads keep your ears warm and block wind on cold winter days, but you can simply pop them off when spring sunshine makes things toasty. If you ski across the full season — from deep January freezes to sunny March afternoons — that adaptability is a real advantage.
Another bonus: with the ear pads removed, many helmets double as a bike or skate helmet for summer use, which adds value. The main trade-off is a slightly bulkier look compared to fixed-pad helmets, and you'll need to keep track of the removable pads so they don't get lost in your gear bag.
If you almost always ski in cold conditions and never ride in warm weather, fixed ear pads are fine. But for all-mountain skiers who want one helmet that handles whatever the mountain throws at them, removable insulated ear pads are tough to beat.