Rubberized or silicone grip palms are designed for one thing: maximum grip, even in wet conditions. If you're racing, skiing in rainy or slushy conditions, or just someone who wants their poles locked in place no matter what, this is your best bet. The rubberized overlays stick to your poles like nothing else, and they're extremely durable too.
The tradeoff is feel and dexterity. These palms add bulk, so you lose that tactile sensation that helps with finer tasks—like adjusting your goggles, zipping jackets, or working your phone. If you're constantly taking gloves on and off throughout the day, that can get annoying fast.
They're most popular with racers and riders who prioritize grip above all else. For typical resort skiing in normal conditions, leather or synthetic suede palms usually offer a better balance of grip and feel. But if you ski a lot in the Pacific Northwest, deal with spring slush, or just want the stickiest grip possible, rubberized palms are worth considering.