I voted for Ings, the reason being, although the Mugen is wind tunnel tested (Ings also) it is made out of fiber only. The Ings you can get in fiber or hybrid-fiber (sort of like a urethane). This can just take more abuse than the full fiber kit. I really like both kits, but will be going with the Ings. I just put the Ings carbon bonnet onto my R on Saturday. Took all of a month for it to arrive, as they make their kits as they are ordered.
Either way you go, you will be happy, as both have their own looks and are sexy looking.
Chris