Board Thread:The Flash discussions/@comment-28354683-20160501172546/@comment-20053828-20160502163816

Techinically, they are both the same, since they cheat speed by using some kind of artificial. Though you can say that Reverse Flash is faster since he can create speed mirages and Zoom can't. It is actually unknown due to the Reverse FLash seen in Season 1 being the one who fought Barry from Season 4 or some season in the future. So it might be Zoom that is faster for the younger version of him.