Never had one little hint of a centering problem on any of my Ti gear Hitec's. I've run 59XX series and 79XX series. Not one little issue.
Futaba's are good servos too, but nowhere near as tough as Hitec's.
Savox servos(Orion)... Well I have no experience with them, but I've seen some big name Savox sponsored racers running Hitec's for steering. So I'd venture to say that Hitec's are better.