Обычно металл берут для долгой работы, но по ссылке что у вас это металл порошковый и вряд ли он сильно лучше пластика.
Плюсы пластика - более мягкая работа, меньший шум малый вес.
Металл предпочитают те кто ездит по грязи, песку поскольку пластик быстро стирается. И те кто катает долго в жару, в этом случае пластик просто плавится.
Выбирайте что вам ближе.
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