I believe the Mugen is the slightly better machine, but must confess to not having seen a Hyper 8 in the flesh yet (very few OFNA/HoBao here in greece). In any case, as is always said, any of the top buggies will allow you to go fast, it's up to you to drive them fast, the Hyper 8 is a solid and high performing buggy. Go with which ever has better parts support in your area/favorite online retailers.