Braking 'biners

Setting up an SRT kit for mine exploring with a club. Which is your preferred setup for use with Petzl Simple descender? A separate dedicated brake carabiner (raumer handy / Edelrid bulletproof) or the dedicated freino z? I read that manky rope can ruin the freino pretty quickly, and routing the rope to it rubs on the body of the simple, but separate carabiners end up making the mailion pretty busy