Given the choice I choose duel elevator servos all day long especially on a plane that size. The issue now becomes connecting them together. IMO I like the duel channel set up but others will argue that with out a digital servo and or a throw meter it is imposible to get them to throw equally and a Y harness is the way to go. Either case is better than joining the elevator halves and using one servo. I made sort of a custom throw meter to establish an acurate throw on my control surfaces no numbers just an adjustable angle where I can fix it and switch it fromone side to the other. Eventually I will get the real 3D throw meter.