I'm pretty sure the Edge is lighter than the Extra. Two Edges at my field, one with a Moki 210 and the other with an OS 160. The one with the 210 is about a pound heavier than the other. I've flown both. Both fly very well. The 210 has the advantage pulling out from a hover and has more latitude with the throttle setting while hovering, but both will climb out. The 160 has the advantage recovering to flight following full stalled 3D maneuvers. Can't go wrong with either engine. The 210 will use a bit more fuel but you can run $6 a gal home brew in it.

Quality is outstanding for an ARF. Toss the 2-56 push rods though. All the horns are steel Sullivan. My friend who runs the 160 has the elevator on pull-pull as well as the rudder and the accuracy and authority cannot be beat. You will however, need the weight of servos in the tail for the 210.