I have driven both and like the mugen better in either aspect. Especially when I get throttle happy the mbx6 loves it. The 2 biggest things I have found a diffrence is, the hyper 9 is not as predicable exiting turns and the mugen is also more forgiving on a jump landing. The build quality and reliability goes to the mugen hands down. I have only had 2 DNF's all year and neither where the cars fault. (Rod got sloppy and kept flaming out and the other time I forgot to lok-tite the ackerman arm bushing/nut.... Thats a good spot for some red stuff) My freind with the hyper 9 has broken arms, diffs, and you name it.