What are you trying to accomplish?
If you are skiing, then you want ski poles. If you are going to be on very steep slopes, then you want ski pole handles with self arrest blades. If you are skiing when you start to slide, you don't have any time to get out a different tool, like a real ice axe.
If you are not skiing, then you are on foot. You may be using trekking poles for support, or maybe not. You may be walking with a real ice axe. If you are on foot when you start to slide, then you have only that trekking pole or that ice axe to stop yourself. An ordinary trekking pole is better than nothing, but not much better. A long-shafted ice axe would be best.
I remember a 2100-foot descent one time. It took only nine minutes with perfect use of a perfect ice axe.