Both clipless pedals and flat pedals have advantages and disadvantages. Clipless pedals can be more efficient, but if you’re riding in soft conditions like sand and snow, they can get clogged and be hard to clip in.
With flat pedals, you can wear standard footwear, including well-insulated winter boots instead of clipless-compatible shoes. While they’re not quite as efficient, they also allow for quick dismounts, which can be key for slippery conditions.