One has speakers[E86] the other does not[G800]. The G has a newer sound set[G800 bank] and 76 keys.. the E86 has 61 keys..so if you need on board speakers..it is an easy pic...If you need a wider key range, the G will fill the bill..for me the 76 keys and newer sound set[other features the E does not have also]...I would choose the G800 over the E86..