I can only speak to my expierence with the 2 pieces. I had a chance to listen to both years ago and I liked the Dual myself. My oldest brother bought the 704 and if I remember right it was a semi-automatic system. I bought the 721 which was fully automatic. I remember that alot of people liked the tone arm alot better on the Dual and was used alot in serious listening while the Technics was used alot by DJ'sI would pick the Dual but its not like I couldnt live with the other.
Good Luck!
Good Luck!