If by quality you also mean reliability... then definitely cable. Because depending on weather conditions... anything wireless can have noise introduced much easier (or perhaps even total signal loss). as for quality of an HD signal... I'd say the most important feature you have to be concerned about is the chipset in your HD video device. I'm a big fan of faroudja video processing. Basically... the stuff inside your video device that converts whatever signal you are sending it to fit your screen size. For example, lets say your screen is 1080x1920 widescreen, well say you feed it a 720p signal... it has to scale up the image to fit your screen size... & how it does that is VERY important.
To achieve the best quality for HDTV, which once did you guy choose. I just bougth Toshiba 52HM84 and just upgrade my cable box to HD Recieve. However I think the quality is not quite sharp like the picture that I saw at Best Buy on the same TV. Do you guy recommend that I should change to Direct TV or Satelline?