C.M.
I am a dental hygienist and would recommend either one, it all depends on what you like. The Oral-B Triumph is definitely a great brush but I have heard from patients who consider it too rough on their mouths, even with using the softer brushhead. The Sonicare can be gentler but some patients don't like the "tickly" feeling on the roof of their mouths.
I personally use the Sonicare and if you have been happy with that then I would stick with what you know and like!